APA

Fogel R. W., Engerman S. L., . (1974). Time on the cross: the economics of American Negro slavery. Boston: Little, Brown.

Chicago

Fogel Robert William, Engerman Stanley L, . 1974. Time on the cross: the economics of American Negro slavery. Boston: Little, Brown.

Harvard

Fogel R. W., Engerman S. L., . (1974). Time on the cross: the economics of American Negro slavery. Boston: Little, Brown.

MLA

Fogel Robert William, Engerman Stanley L, . Time on the cross: the economics of American Negro slavery. Boston: Little, Brown. 1974.