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Quorum Books, 1988
Buku Teks
Sturrock, Ford, author
Pitman, 1982
Buku Teks
edited by Elizabeth Marting
American Management Association, 1956
Buku Teks
Merchant, Kenneth A., author
Pearson education, 2012
Buku Teks
Callaby, F. A.
Kanisius, 1976
Buku Teks