Brown, Sandra, author
Gramedia Pustaka Utama, 2022
Buku Teks
Bassem Kabouk, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2020
UI - Tesis (Membership)
McIver, Colin
Longman , 1972
Buku Teks
American Enterprise Institute for Public Policy Research, 1977
Buku Teks
Rees, Colin, author
Churchill Livingstone/Elsevier, 2012
Buku Teks