Broek, J. O. M. (1980). The Study and teaching of geography. C.E. Merrill Pub. Co..
Cita Chicago (17th ed.)Broek, Jan O. M. The Study and Teaching of Geography. Columbus: C.E. Merrill Pub. Co., 1980.
Cita MLA (8th ed.)Broek, Jan O. M. The Study and Teaching of Geography. C.E. Merrill Pub. Co., 1980.
Atenció: Aquestes cites poden no estar 100% correctes.