Rahmat Saleh, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2012
UI - Skripsi (Open)
Ali Mudlofir, author
Rajawali, 2011
Buku Teks
Taba, Hilda, author
Harcourt Brece & World, 1962
Buku Teks
Nicholls, Audrey, author
George Allen and Unwin, 1972
Buku Teks
Artikel Jurnal