Aldine Publishing Company, 1964
Buku Teks SO
Khusnul Hatimah
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2014
UI - Tesis Membership
Ambrose, Timothy
Routledge, 1995
Buku Teks
Woo, Kyu Sung
Rockport Publishers, 1999
Buku Teks SO
Edwards, Edward
Thoemmes Press, 1996
Buku Referensi