Sherman, Kenneth, author
Reston Publishing company, 1981
Buku Teks
edited by Ray Sarch
McGraw-Hill, 1990
Buku Referensi
Macek, Rosanne M.
Meckler Corporation, 1988
Buku Referensi
Dewey, Patrick R.
Meckler Corporation, 1987
Buku Referensi
Universitas Indonesia, 2008
UI - Tugas Akhir