Younger, Richard D.
Brown University Press, 1963
Buku Teks
Seckler-Hudson, Catheryn, author
United State Information Service, 1959
Buku Teks
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2014
UI - Skripsi (Membership)
Olmstead, Clifton E., author
Prentice-Hall, 1960
Buku Teks
Department of Health , 1977
Buku Teks