Bouquet, A.C.
Comparative religion : a short outline
Penguin Books, 1953
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Schroeder, Richard C.
An outline American government
International Communicational Agency, [date of publication not identified]
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An outline of American Government
edited by Nathan Glick
United Sates Information Agency, 1989
 Buku Teks SO
Outline of U.S. government
United States Department of State, 1991
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Stokoe, William C.
Sign language structure : an outline of the visual communication systems of the American deaf / William C. Stokoe
University of Buffalo, 1960
 Buku Teks SO