APA (7th ed.) Citation

Crystal, D. (1985). What is linguistics? / David Crystal (4th ed.). Edward Arnold.

Chicago Style (17th ed.) Citation

Crystal, David. What Is Linguistics? / David Crystal. 4th ed. London: Edward Arnold, 1985.

MLA (9th ed.) Citation

Crystal, David. What Is Linguistics? / David Crystal. 4th ed. Edward Arnold, 1985.

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