Higgins, Jack
A Signet Book, 1985
Buku Teks SO
Billington, Michael
Macmillan, 1990
Buku Teks SO
Denny Andres
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 1996
UI - Skripsi Membership
Unwin, Tim
Longman Scientific & Technical, 1992
Buku Teks SO
Boom, Coorie ten
Bantam Books, 1971
Buku Teks SO