Long, M.H. (1985) A role for instruction in second language acquisition. In K. Hyltenstam and M. Pienemann (Eds.) Modelling and assessing second language acquisition. Clevedon, Avon: Multilingual Matters. 77-100.
Long, M.H. (1989a) Task, group, and task-group interactions. University of Hawaii Working papers in ESL, 8(2):1-26.