Lambert, W., Havelka, J., & Crosby, C. (1958). The influence of language-acquisition contexts on bilingualism. Journal of Abnormal and Social Psychology, 56, 239-244. [FULLTEXT]
A History of Psycholinguistics
Bibliography for Levelt (2013)

Lambert, W., Havelka, J., & Crosby, C. (1958). The influence of language-acquisition contexts on bilingualism. Journal of Abnormal and Social Psychology, 56, 239-244. [FULLTEXT]