Bednar, Richard L.
Brooks/Cole Pub., 1991
Buku Teks
Hinkle, Deborah A.
MCGraw-Hill , 2002
Multimedia
Hinkle, Deborah A., author
Glencoe McGraw-Hill, 1998
Buku Teks
Wheeler, James E., author
Richard D. Irwin , 1981
Buku Teks
Duronio, Margaret A.
Jossey - Bass Publishers , 1991
Buku Teks