edited by Harold M. Groves
Henry Holt Company , 1950
Buku Teks
edited by Harold M. Groves
Henry Holt and Company , 1947
Buku Teks
Farid Addy Sumantri, author; Ika Agustiani, author
Fakultas Ekonomi dan Bisnis Universitas Muhammadiyah Prof. Dr. Hamka, 2017
Artikel Jurnal
Andriana Peiter, author
2007
UI - Tesis (Membership)
Marcella, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2009
UI - Skripsi (Open)