Whitaker, Leighton C.
Fla. : CRC Press, , 2000.
Buku Teks
Baron, Robert A., author
Allyn and Bacon, 1987
Buku Teks
Baron, Robert A., author
Allyn and Bacon, 1994
Buku Teks
Feldman, Robert S., author
McGraw-Hill, 2015
Buku Teks
Feldman, Robert S., author
McGraw-Hill , 2005
Buku Teks