Παραπομπή APA

O'Dell, A. (1967). Geography: Our earth and its people. Grolier.

Παραπομπή Chicago Style

O'Dell, A.C. Geography: Our Earth and Its People. London: Grolier, 1967.

Παραπομπή MLA

O'Dell, A.C. Geography: Our Earth and Its People. Grolier, 1967.