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Campbell, Russell N.; Gray, Tracy C.; Rhodes, Nancy C.; Snow, Marguerite Ann (1 Mar 1985). "Foreign Language Learning in the Elementary Schools: A Comparison of Three Language Programs". The Modern Language Journal (بالإنجليزية). 69 (1): 44–54. DOI:10.1111/j.1540-4781.1985.tb02526.x. ISSN:1540-4781.
Antoniou, M., Wong, P. M., & Suiping, W. (2015). The Effect of Intensified Language Exposure on Accommodating Talker Variability. Journal of Speech, Language & Hearing Research, 58(3), 722-727. دُوِي:10.1044/2015_JSLHR-S-14-0259
Duncan, T. S., & Paradis, J. (2016). English language learners' nonword repetition performance: the influence of age, L2 vocabulary size, length of L2 exposure, and L1 phonology. Journal of Speech, Language, and Hearing Research, (1), 39. دُوِي:10.1044/2015_JSLHR-L-14-0020
Kinginger، Celeste (1 مارس 2011). "Enhancing Language Learning in Study Abroad". Annual Review of Applied Linguistics. ج. 31: 58–73. DOI:10.1017/S0267190511000031. ISSN:1471-6356.
Campbell, Russell N.; Gray, Tracy C.; Rhodes, Nancy C.; Snow, Marguerite Ann (1 Mar 1985). "Foreign Language Learning in the Elementary Schools: A Comparison of Three Language Programs". The Modern Language Journal (بالإنجليزية). 69 (1): 44–54. DOI:10.1111/j.1540-4781.1985.tb02526.x. ISSN:1540-4781.