Cita APA

Purdy, G. A. (1958). Petroleum prehistoric to petrochemicals. New York: McGraw-Hill Book Co.

Citación estilo Chicago

Purdy, G. A. Petroleum Prehistoric to Petrochemicals. New York: McGraw-Hill Book Co, 1958.

Cita MLA

Purdy, G. A. Petroleum Prehistoric to Petrochemicals. New York: McGraw-Hill Book Co, 1958.

Precaución: Estas citas no son 100% exactas.