APA (7th ed.) Citation

Purdy, G. A. (1958). Petroleum: Prehistoric to petrochemicals. Copp Clark Publishing Company.

Chicago Style (17th ed.) Citation

Purdy, Gordon A. Petroleum: Prehistoric to Petrochemicals. U.S.A: Copp Clark Publishing Company, 1958.

MLA (9th ed.) Citation

Purdy, Gordon A. Petroleum: Prehistoric to Petrochemicals. Copp Clark Publishing Company, 1958.

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