Nishikawa, T. (2021/2023). Acquisition of morphology by L2 children in naturalistic environments: A case of Japanese case markers. International Review of Applied Linguistics in Language Teaching, 61(3), 909-937. https://doi.org/10.1515/iral-2021-0092【要旨】
Nishikawa, T. (2022). Non-nativelike outcome of naturalistic child L2 acquisition of Japanese: The case of noun–verb collocations. International Review of Applied Linguistics in Language Teaching, 60(2), 287-314. https://doi.org/doi:10.1515/iral-2018-0292【要旨】
西川朋美（2019）「日本の公立学校における日本語を母語としない子どもへの言語教育」近藤ブラウン妃美・坂本光代・西川朋美（編）『親と子をつなぐ継承語教育―日本・外国にルーツを持つ子ども―Heritage language education connecting generations: From the Japanese perspective』（pp.209-223）くろしお出版
Nishikawa, T. (2014). Nonnativeness in near-native child L2 starters of Japanese: Age and the acquisition of relative clauses. Applied Linguistics, 35, 504-529. https://doi.org/10.1093/applin/amu018【要旨】
Kanno, K., Hasegawa, T., Ikeda, K., Ito, Y. & Long, M. H. (2008). Prior language-learning experience and variation in the linguistic profiles of advanced English-speaking learners of Japanese. In D. Brinton, O. Kagan & S. Bauckus (Eds.), Heritage language acquisition: A new field emerging (pp. 165-180). Mahwah, NJ: Lawrence Erlbaum Associates.
Hasegawa, T. (2008). Measuring the Japanese proficiency of Japanese heritage language children. In K. Kondo-Brown & J. D. Brown (Eds.), Teaching Chinese, Japanese, and Korean heritage students: Curriculum, needs, materials, and assessment (pp.77-97). Mahwah, NJ. Lawrence Erlbaum Associates.
Hasegawa, T. (2005). Relative clause production by JSL children. In M. Minami, H. Kobayashi, M. Nakayama & H. Shirai (Eds.), Studies in Language Sciences (4): Papers from the Fourth Annual Conference of the Japanese Society for Language Sciences (pp. 189-204). Tokyo: Kuroshio Publishers.
Kanno, K., Hasegawa, T., Ikeda, K. & Ito, Y. (2005). Linguistic profiles of heritage bilingual learners of Japanese. In J. Cohen, K. McAlister, K. Rolstad & J. MacSwan (Eds.), Proceedings of the 4th International Symposium on Bilingualism (pp.1139-1151). Somerville, MA: Cascadilla Press.
菅野和江・長谷川朋美・池田佳子・伊藤泰子（2005）「習得環境の違う日本語上級学習者の言語知識プロファイル」. Journal of the Canadian Association for Japanese Language Education: Japanese Linguistics and Pedagogy, 7 , 1-22
Siegman, C., Kim, J., Nishikawa, T., Jocson, C., & Grüter, T. (2024). The HALA Online: Test manual and materials. Kaipuleohone, the University of Hawai’i’s Ethnographic Archive. 【URL】
Nishikawa, T. (2023.10.26). Nativelikeness in L2 maturational constraints: L2 acquisition of Japanese by immigrant children in Japan. Brown Bag Lecture Series, Department of Second Language Studies, University of Hawaiʻi at Mānoa, USA.
西川朋美（2019.10.5）「日本の学校に通う外国ルーツの子どものための継承語教育 Heritage Language Education for Language Minority Children in Japanese Schools」，パネルディスカッション（with 近藤ブラウン妃美・坂本光代）「バイリンガルのための継承語教育と研究における課題と傾向 Issues and Trends in Heritage Language Education & Research for Bilinguals」，シンポジウム「親と子をつなぐ継承語教育―日本・外国にルーツを持つ子ども―Heritage Language Education Connecting Generations: From the Japanese Perspective」，上智大学
Nishikawa, T. (2010). Vietnamese as a heritage language in a Japanese public elementary school. Fourth Summer Heritage Research Institute, Heritage Speakers: Linguistics and Pedagogy, as part of the Panel “Teaching and research for heritage learners of Asian and Pacific languages” organized by Kimi Kondo-Brown, University of Hawaii at Manoa, USA.
Kanno, K., Hasegawa, T., Ikeda, K., & Ito, Y. (2003). Linguistic profiles of advanced English-speaking learners of Japanese. The 6th National Council of Organizations of Less Commonly Taught Languages, as part of the Colloquium “Profiling the Advanced LCTL Learner” organized by Michael H. Long and Catherine J. Doughty, University of California, Los Angeles, USA.
Nishikawa, T. (2025.6.14). Chinese as a heritage language in a non-English-speaking country: A study on language dominance using the HALA task. The 25th International Conference of the Japan Second Language Association, Shizuoka University, Japan.（ポスター発表）
Siegman, C., Kim, J., Nishikawa, T., Jocson, C., & Grüter, T. (2025.3.8). The HALA Online: An updated and more accessible tool for assessing relative language strength. 9th International Conference on Language Documentation & Conservation: Navigating new realities in diaspora communities, University of Hawaiʻi at Mānoa, USA.
Siegman, C., Kim, J., Nishikawa, T., Jocson, C., & Grüter, T. (2024.4.6). The HALA Online. Mānoa Interdepartmental Language Symposium, University of Hawaiʻi at Mānoa, USA.
西川朋美・青木由香・細野尚子・樋口万喜子（2013.8.24）「子どものL2能力評価における母語話者基準とは？－動詞に焦点を当てた語彙力調査の結果から－」 Canadian Association for Japanese Language Education Annual Conference 2013, University of Toronto, Canada. （ポスター発表）
Hasegawa, T. (2009.5.21). Growing up as Vietnamese-Japanese bilinguals: Vietnamese heritage children in Yokohama. Port-City University League (PUL), The 4th Meeting, Yokohama National University, Japan.
Hasegawa, T. (2008). Multilingualism in Yokohama, Port-City University League (PUL), The 3rd Meeting, University of Lisbon, Portugal.
Hasegawa, T. (2008). Relative clause comprehension and production by young L1/ L2 speakers of Japanese. Second Language Research Forum 2008, University of Hawaii at Manoa.
Hasegawa, T. (2008). The uninevitability of native-like attainment in child L2 acquisition of Japanese. The 9th Annual Tokyo Conference on Psycholinguistics, Keio University, Tokyo, Japan.
Hasegawa, T. (2006). Native like knowledge without native like performance in (very) early child L2 acquisition. The 30th Boston University Conference on Language Development, Boston University, USA. (Poster Presentation)
Hasegawa, T. (2006). How native-like are early child L2 learners, really? The 8th Annual Conference of the Japanese Society for Language Sciences, International Christian University, Tokyo, Japan. (Poster Presentation)
Hasegawa, T. (2004). Producing marked relative clauses: What near-native child L2 Japanese speakers cannot do. The Second Language Research Forum 2004, Pennsylvania State University, USA
Kanno, K., Hasegawa, T., Ikeda, K., & Ito, Y. (2003). Linguistic profiles of bilingual learners of Japanese. The 4th International Symposium on Bilingualism, Tempe, Arizona, USA.
Hasegawa, T. (2002). The acquisition of Japanese relative clauses in child SLA. The Second Language Research Forum 2002, University of Toronto, Canada.
