Brown, Gillian, Kirsten Malmkj?r og John Williams (red.): Performance & Competence in Second language acquisition. kap. 1-5, Cambridge University Press 1996
Eckman, Fred mfl. (red.): Second Language Acquisition Theory and Pedagogy, kap. 1-4, kap. 9-13 og kap. 16, Lawrence Erlbaum Ass. Publishers 1995
Holmen, Anne: Utviklingslinier i tilegnelsen af dansk som andetsprog, K?benhavnerstudier i tosprogethed nr 12, 1990
Towell, Richard og Roger Hawkins: Approaches to Second Language Acquisition, kap.1-5, Multilingual Matters 1994
Kompendium:
Gregg, K.R.: The variable competence model of second language acquisition and why it isn't. I Applied Linguistics 1990, 11/4
Ellis, R.: A response to Gregg in Applied Linguistics 1990. I Applied Linguistics 1990, 11/4
Tarone, E.E.: On variation in interlanguage: a response to Gregg. I Applied Linguistics 1990, 11/4
Lund, Karen: Communicative Function and Language Specific Structure in Second Language Acquisition. I E. Engberg-Pedersen (red.): Content, Expression, and Structure in Danish Functional Grammar. Studies in Language Companion Series, Benjamins Amsterdam 1996