Henny Heryatni, author
2004
UI - Skripsi (Membership)
R. Muhammad Mulyadi, author
Universitas Indonesia, 1999
UI - Tesis (Membership)
Vania Olivia, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2017
UI - Skripsi (Membership)
Feather, Leonard, author
Horizon Press, 1960
Buku Referensi
Harry S. Dent, author
Prestasi Pustaka, 2001
Buku Teks