Payne, James
Illinois National Textbook, 1994
Buku Teks
Olsen, Gary
Ohio North Light Books , 1997
Buku Teks
Davis, William S.
Addison-Wesley , 1988
Buku Teks
Rougier, Harry
W.W. Norton, 1970
Buku Teks
Beckerman, Andrew P.
Oxford University Press, 2017
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