Impact Books, 1993
Buku Referensi
Friedman, Jack P., author
Barron's Educational Series, 2007
Buku Referensi
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2000
UI - Skripsi (Membership)
Ranganathan, S.R., author
Ranganathan Endowment for Library Science, 1992
Buku Teks
Pasaribu, Chandra Sahala, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1994
UI - Skripsi (Membership)