Fraser, Marshall, author
Burgess Publishing Company, 1979
Buku Teks
Shannon, George W. B.
Harper & Row , 1989
Buku Teks
Aan Suhaeni, author
Universitas Indonesia, 1988
UI - Skripsi (Membership)
Smith, Elton Edward
Twayne Publishers, 1965
Buku Teks
Paley, Marton D.
Oxford at The Clarendon Press , 1970
Buku Teks