Cambridge University Press, 2019
eBooks
Siwage Dharma Negara
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2000
UI - Tesis Membership
IEA Publications, 2008
Buku Teks
Dorf, Richard C.
Addison-Wesley, 1978
Buku Teks
Australian Government Publishing Service, 1968
Buku Teks