APA-referens (7:e uppl.)

Leonard, J. N. (1974). The first farmers. Time-Life International.

Chicago-referens (17:e uppl.)

Leonard, Jonathan Norton. The First Farmers. Nederland: Time-Life International, 1974.

MLA-referens (9:e uppl.)

Leonard, Jonathan Norton. The First Farmers. Time-Life International, 1974.