Bennett, Scott
American Management Association, 2005
eBooks
Muhammad Ridwan
Fakultas Teknik Universitas Indonesia, 2000
UI - Skripsi (Membership)
Amir M.S.
Pustaka Binaman Pressindo, 2003
Buku Teks
Amelia Djamaoeddin
Universitas Indonesia, 2004
UI - Tesis (Membership)
Thomas, Graham Stuart
Oregon Sagapress, 1990
Buku Teks