Thung, Yvonne
Cornell University, 1973
Buku Referensi
Eppy Ananditya Susilo, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2014
UI - Skripsi (Membership)
Fisher, H.A.L.
London, Baterworth, 1932
Buku Teks
Edwards, Heather M., 1947-, author
Scarecrow Press, 1990
Buku Teks
Thompson, James, author
Clive Bingley, 1987
Buku Teks