Cita APA (7a ed.)

Leffler, W. L. (1985). Petroleum refining in nontechnical language (3rd.ed.). Pennwell.

Cita Chicago Style (17a ed.)

Leffler, William L. Petroleum Refining in Nontechnical Language. 3rd.ed. Oklahoma: Pennwell, 1985.

Cita MLA (8a ed.)

Leffler, William L. Petroleum Refining in Nontechnical Language. 3rd.ed. Pennwell, 1985.