Cita APA

Fogel, R. W., & Engerman, S. L. (1974). Time in the cross. The economics of American negro slavery. Boston US: Little, Brown and Company.

Citación estilo Chicago

Fogel, Robert William., y Stanley L. Engerman. Time in the Cross. The Economics of American Negro Slavery. Boston US: Little, Brown and Company, 1974.

Cita MLA

Fogel, Robert William., y Stanley L. Engerman. Time in the Cross. The Economics of American Negro Slavery. Boston US: Little, Brown and Company, 1974.