Bouquet, A.C.
Comparative religion : a short outline
Penguin Books, 1953
 Buku Teks SO
An outline of American Government
edited by Nathan Glick
United Sates Information Agency, 1989
 Buku Teks
Schroeder, Richard C.
An outline American government
International Communicational Agency, [date of publication not identified]
 Buku Teks SO
Outline of U.S. government
United States Department of State, 1991
 Buku Teks
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