APA (7th ed.) Citation

PURDY, G. (1957). Petroleum - Pretistioric to petrochemicals - G.A. Purdy. Copp Clark Publishing Company.

Chicago Style (17th ed.) Citation

PURDY, G.A. Petroleum - Pretistioric to Petrochemicals - G.A. Purdy. Copp Clark Publishing Company, 1957.

MLA (8th ed.) Citation

PURDY, G.A. Petroleum - Pretistioric to Petrochemicals - G.A. Purdy. Copp Clark Publishing Company, 1957.

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