Duyck, W., Szmalec, A., Kemps, E., & Vandierendonck, A. (2003) Verbal working memory is involved in associative word learning unless visual codes are available. Journal of Memory and Language, 48, 527-541.
Gathercole, S. E., Hitch, G. J., Service, E., & Martin, A. J. (1997) Phonological short-term memory and new word learning in children. Developmental Psychology, 33, 966-979.
Henry, L. (2012) The development of working memory in children. SAGE, London.