APA (7th ed.) Citation

Sully & Unstead. (1973). Automobile engines (questions & answers (3rd. edition.). Butterworth.

Chicago Style (17th ed.) Citation

Sully and Unstead. Automobile Engines (questions & Answers. 3rd. edition. London: Butterworth, 1973.

MLA (8th ed.) Citation

Sully and Unstead. Automobile Engines (questions & Answers. 3rd. edition. Butterworth, 1973.

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