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Campbell, Russell N.; Gray, Tracy C.; Rhodes, Nancy C.; Snow, Marguerite Ann (March 1, 1985). "Foreign Language Learning in the Elementary Schools: A Comparison of Three Language Programs". The Modern Language Journal. 69 (1): 44–54. doi:10.1111/j.1540-4781.1985.tb02526.x. ISSN1540-4781.
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. doi: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. doi:10.1044/2015_JSLHR-L-14-0020
Riestra, Miguel A.; Johnson, Charles E. (September 1, 1964). "Changes in Attitudes of Elementary-School Pupils Toward Foreign-Speaking Peoples Resulting From the Study of a Foreign Language". The Journal of Experimental Education. 33 (1): 65–72. doi:10.1080/00220973.1964.11010856. ISSN0022-0973.
Campbell, Russell N.; Gray, Tracy C.; Rhodes, Nancy C.; Snow, Marguerite Ann (March 1, 1985). "Foreign Language Learning in the Elementary Schools: A Comparison of Three Language Programs". The Modern Language Journal. 69 (1): 44–54. doi:10.1111/j.1540-4781.1985.tb02526.x. ISSN1540-4781.