Cita APA (7a ed.)

Fogel, R. W., & Engerman, S. L. (1974). Time on the cross: The economics of American negro slavery. Norton & Co.

Cita Chicago Style (17a ed.)

Fogel, Robert William, y Stanley L. Engerman. Time on the Cross: The Economics of American Negro Slavery. New York, N.Y. [u.a.]: Norton & Co, 1974.

Cita MLA (8a ed.)

Fogel, Robert William, y Stanley L. Engerman. Time on the Cross: The Economics of American Negro Slavery. Norton & Co, 1974.