Artikel Jurnal
Fess, Philip E., author
Erlangga, 1983
Buku Teks
Niswonger, C. Rollin (Clifford Rollin), 1907-, author
Erlangga, 1999
Buku Teks
Burby, Raymond J., author
Liberty, [Date of publication not identified]
Buku Teks
Ang, Alfredo H-S. (Hua-Sing), 1930-, author
Erlangga, 1987
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