Evans, David
Melbourne University Press, 2002
Buku Teks SO
Furseth, Inger
Sage, 2013
Buku Teks SO
Watson, George
Longman, 1987
Buku Teks SO
Davis, Gordon B.
Barron's Educational Series, 1979
Buku Teks SO
Dian Masniari
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2013
UI - Skripsi Membership