Berch, Michael A.
West, 2010
Buku Teks SO
Hall, Kermit L.
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Buku Teks
Jones, Harry W.
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Buku Teks
Glendon, Mary Ann
St. Paul, Minn West Publishing 1991,
Buku Teks
edited by Hideo Tanaka and Malcolm D.H. Smith
University of Tokyo Press, 1976
Buku Teks