East, W. Gordon
Our fragmented world : an introduction to political geography / W. Gordon East, J.R.V. Prescott
Macmillan, 1975
 Buku Teks
Jackson, W.A. Douglas
Politics and geographic relationships: readings on the nature of political geography / W. A. Douglas Jackson
Prenciton-Hall , 1964
 Buku Teks
Clark, Wilfrid E. Le Gros
The antecedents of man : an introduction to the evolution of the primates / W. E. Le Gros Clark
Quadrangle Books, 1971
 Buku Teks
Culicover, Peter W.
Syntax / Peter W. Culicover
Academic Press, 1976
 Buku Teks
Buss, Leo W.
The evolution of individuality / Leo W. Buss
Princeton University Press, 1987
 Buku Teks