Butler, David
National University, 1972
Buku Teks
George Allen and Unwin, 1982
Buku Teks
Crisp, L. F. (Leslie Finlay), author
Longman Chesire, 1965
Buku Teks
Solomon, David Harris, author
Thomas Nelson, 1973
Buku Teks
Purbasari, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1999
UI - Skripsi (Membership)