Sultan Ahmad
Washington, D.C. The World Bank c. 1980,
Buku Teks
Blatner, David, author
Peachpit Press, 2002
Buku Teks
Aji Kusumanto, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2009
UI - Tesis (Open)
McAlevey, Jane F., author
Oxford University Press, 2016
eBooks
Brahmanti Prameswari, author
Fakultas Eknonomi dan Bisnis Universitas Indonesia, 2009
UI - Tesis (Open)