Walters, Stan B., author
CRC Press, 2003
Buku Teks
Cohen, Akiba A., author
Sage Publications, 1987
Buku Teks
Annisa Dinia, author
2016
UI - Skripsi (Membership)
Port, Michael, author
Houghton Mifflin Harcourt, 2015
Buku Teks
Beshara, Tony, 1948- , author
American Management Association, 2006
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