Cita APA (7th ed.)

King, C. B., & Risher, H. W. (1969). The Negro in the petroleum industry. Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press.

Cita Chicago (17th ed.)

King, Carl B., i Howard W. Risher. The Negro in the Petroleum Industry. Philadelphia: Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press, 1969.

Cita MLA (8th ed.)

King, Carl B., i Howard W. Risher. The Negro in the Petroleum Industry. Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press, 1969.