Certo, Samuel C.
Irwin , 1995
Buku Teks
Pindi Kisata, author
Bumi Aksara , 2005
Buku Teks
Catherine Mulyadi, author
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UI - Tesis (Membership)
Simanjuntak, Kristina, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2017
UI - Tesis (Membership)
Covey, Stephen R., author
Bina Rupa Aksara, 1994
Buku Teks