Clear, Todd R.
Wadsworth, 1999
Buku Teks
Bayens, Gerald, author
McGraw-Hill, 2013
Buku Teks
Brownlee, Ian, author
Longman, 1998
Buku Teks
Alarid, Leanne Fiftal, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Carney, Louis P., author
McGraw-Hill, 1977
Buku Teks