Allen, Harry E.
Macmillan Publishing Company, 1989
Buku Teks
DeLisi, Matt, author
Jones and Barlett Publishers, 2010
Buku Teks
Alarid, Leanne Fiftal, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Eldefonso, Edward
Glencoe Press, 1974
Buku Teks
Jarvis, Dwight C., author
McGraw-Hill, 1978
Buku Teks