APA (7th ed.) Citation

Crystal, D. (1985). Linguistics (2nd ed.,[rep. 1985].). Penguin books.

Chicago Style (17th ed.) Citation

Crystal, David. Linguistics. 2nd ed.,[rep. 1985]. New York [etc.]: Penguin books, 1985.

MLA (9th ed.) Citation

Crystal, David. Linguistics. 2nd ed.,[rep. 1985]. Penguin books, 1985.