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Buku Teks
Glueck, William F., author
McGraw-Hill, 1980
Buku Teks
editor, M.J. Dooher ; associate editor, V. Marquis
American Management Association, 1953
Buku Teks
RMIT University
Palgrave Macmillan, 2012
Buku Teks
Prentice-Hall, 1962
Buku Teks