Andrews, Andy, author
Gramedia Pustaka Utama, 2005
Buku Teks
Streibel, Barbara J., author
RajaGrafindo Persada, 2004
Buku Teks
Miftah Thoha, author
Rajawali, 2004
Buku Teks
Simons, Robert, author
Upper Saddle River Prentice Hall 1999,
Buku Teks
Jakarta [place of publication not identified] 1988,
Buku Teks