Gardiner, Gareth S.
Peterso's, 1996
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Lawal, Ibironke O., author
Chandos Publishing, 2009
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Ries, Al, author
McGraw-Hill, 1986
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Arif Widyantoro, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2016
UI - Tesis Membership
Kotler, Philip, author
John Wiley & Sons, 2005
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