APA (7th ed.) Citation

Crystal, D., & Davy, D. (1969). Investigating English style. Longmans.

Chicago Style (17th ed.) Citation

Crystal, David, and Derek Davy. Investigating English Style. Harlow: Longmans, 1969.

MLA (8th ed.) Citation

Crystal, David, and Derek Davy. Investigating English Style. Longmans, 1969.

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