APA (7th ed.) Citation

Purdy, G. A. (1958). Petroleum : prehistoric to petrochemicals / by G.A. Purdy: Prehistoric to petrochemicals. Copp Clark.

Chicago Style (17th ed.) Citation

Purdy, G. A. Petroleum : Prehistoric to Petrochemicals / by G.A. Purdy: Prehistoric to Petrochemicals. Copp Clark, 1958.

MLA (9th ed.) Citation

Purdy, G. A. Petroleum : Prehistoric to Petrochemicals / by G.A. Purdy: Prehistoric to Petrochemicals. Copp Clark, 1958.

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