Owen, Oliver S., author
Natural resource conservation : management for a sustainable future
Prentice-Hall, 1998
 Buku Teks
Greenland, David, author
Guidelines for modern resource management soil, land, water, air
Charles E. Merrill, 1983
 Buku Teks
The constitution of the United States of America
United States Information Agency, 1987
 Buku Teks
Fincher, E. B., author
The President of the United States
Abelard-Schuman, 1955
 Buku Teks
Reischauer, Edwin O., author
The United States and Japan
Harvard University Press, 1950
 Buku Teks
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