Davis, Keith, 1918-, author
McGraw-Hill, 1984, c1972
Buku Teks
Jackson, Susan E., author
South Westh Western College, 2000
Buku Teks
Greenlaw, Paul S.
Harper & Row, 1986
Buku Teks
Kreitner Robert
OLC, {s.a}
Buku Teks
Pheng, Low Sui, author
Springer Singapore, 2019
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