APA (7th ed.) Citation

Frankel, P. H. (1969). Essentials of petroleum: A key to oil economics (New ed.). Cass.

Chicago Style (17th ed.) Citation

Frankel, Paul H. Essentials of Petroleum: A Key to Oil Economics. New ed. London: Cass, 1969.

MLA (9th ed.) Citation

Frankel, Paul H. Essentials of Petroleum: A Key to Oil Economics. New ed. Cass, 1969.

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