Simpson, George Gaylord, author
Harcourt Brace & World, 1969
Buku Teks
Breneman, W.R., author
Xerox College Publishing, 1959
Buku Teks
Bailey, Paul C.
International Textbook Company, 1969
Buku Teks
Kugler, Otto E.
Burges Publishing, 1968
Buku Teks
Watterson, Ray L., author
Burgess Publishing Comp , 1969
Buku Teks