Dalton, George, author
Penguin Education, 1975
Buku Teks
Mannheim, Karl, author
Harcourt, Brace, 1951
Buku Teks
edited by I. William Zartman and William Mark Habeeb
Westerview Press, 1993
Buku Teks
DuBrin, Andrew J., author
Business Publications, 1982
Buku Teks
CRC press, 2021
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