West, David
Intermedia, 1977
Buku Teks
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1962
UI - Skripsi (Membership)
Doren, Carl van, author
World Publishing, 1948
Buku Teks
Walsh, Henry H., author
The Stephen Press, 1969
Buku Teks
Franklin, Benjamin, author
Washington Square Press, 1961
Buku Teks