George Allen and Unwin, 1982
Buku Teks
Solomon, David Harris
Thomas Nelson, 1973
Buku Teks
Crisp, L.F. (Leslie Finlay)
Longman Chesire, 1965
Buku Teks
Purbasari
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1999
UI - Skripsi Membership
editor, Cameron Hazlehurst
Australian National University Press, 1979
Buku Teks SO