Houston, Brant, author
St. Martin Press, 1996
Buku Referensi
Pasaribu, Christian Agust, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2015
UI - Skripsi (Membership)
Gibson, Charles H., author
Thomson, 2005
Buku Teks
Whanegi Skar Al Khalifi, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2018
UI - Skripsi Membership
Putri Farhah Thaliah, author
2017
UI - Skripsi (Membership)