Teichert, Pedro C.M., author
Bureau of Business Research Mississippi University , 1959
Buku Teks
Beatley, Timothy, editor
Island Press, 2012
eBooks
Hosmer, LaRue T.
Prentice-Hall, 1982
Buku Teks
Abel Yudo Prakoso, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2017
UI - Makalah dan Kertas Kerja
Institute of Social Studies
Institute of Social Studies, 2000
Buku Teks