Tham khảo Ngôn_ngữ_thứ_hai

  1. ↑ Wong, Lung-Hsiang; Sing-Chai, Ching; Poh-Aw, Guat (2017). Seamless Language Learning: Second Language Learning with Social Media. Comunicar 25 (50): 9-21. ISSN 1134-3478. doi:10.3916/c50-2017-01.
  2. ↑ Susanne Rieckborn: Erst- und Zweitspracherwerb im Vergleich - eine Studie zum Erwerb von Tempus und Aspekt im Deutschen und Französischen (Diss.). Kovac-Verlag, Hamburg 2007 ISBN 3-8300-2905-5.
  3. ↑ Seliger, H. W. & Vago, R. M. (1991). "The Study of First Language Attrition: an overview". In: First Language Attrition, Seliger, H. W. & Vago, R. M. (eds.), pp. 3–15. Cambridge University Press.
  4. ↑ Gauthier, Karine; Genesee, Fred (March 2011). "Language Development in Internationally Adopted Children: A Special Case of Early Second Language Learning". Child Development. 82 (3): 887–901. doi:10.1111/j.1467-8624.2011.01578.x.
  5. ↑ Scarcella, Robin; Krashen, Stephen D.; Michael A. Long (Dec 1979). "Age, Rate and Eventual Attainment in Second Language Acquisition". TESOL Quarterly. 13 (4): 573–582. doi:10.2307/3586451. JSTOR 3586451.