APA (7th ed.) Citation

Crystal, D., & Davy, D. (1975). Advanced conversational English. Longman.

Chicago Style (17th ed.) Citation

Crystal, David, and Derek Davy. Advanced Conversational English. London: Longman, 1975.

MLA (9th ed.) Citation

Crystal, David, and Derek Davy. Advanced Conversational English. Longman, 1975.

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