Παραπομπή APA

Purdy, G. A. (1958). Petroleum: Prehistoric to petrochemicals. Vancouver : New York: Copp Clark Publishing Company ; McGraw-Hill Book Company.

Παραπομπή Chicago Style

Purdy, Gordon A. Petroleum: Prehistoric to Petrochemicals. Vancouver : New York: Copp Clark Publishing Company ; McGraw-Hill Book Company, 1958.

Παραπομπή MLA

Purdy, Gordon A. Petroleum: Prehistoric to Petrochemicals. Vancouver : New York: Copp Clark Publishing Company ; McGraw-Hill Book Company, 1958.

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