APA (7th ed.) Citation

(1990). The development of second language proficiency (1. publ.). Cambridge Univ. Press.

Chicago Style (17th ed.) Citation

The Development of Second Language Proficiency. 1. publ. Cambridge [u.a.]: Cambridge Univ. Press, 1990.

MLA (9th ed.) Citation

The Development of Second Language Proficiency. 1. publ. Cambridge Univ. Press, 1990.

Warning: These citations may not always be 100% accurate.