Rafael Altamira
Van Nostrand Reinhold Co., 1949
Buku Teks
Rafael Raga Maran
Rineka Cipta, 2007
Buku Teks
Selo Soemardjan, author
UI-Press, 1981
UI - Pidato
Dedy Budiman
Gramedia Pustaka Utama, 2011
Buku Teks
Schwartz, Matthew, author
American Management Association, 2006
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