Shellhammer, H. S., author
The National Press, 1965
Buku Teks
edited by by Thomas C. Grubb
Burgess, 1975
Buku Teks
Moment, Grindner B., author
Houghton Miffiln, 1967
Buku Teks
by Tracy I. Storer ... [et al.]
McGraw-HIll, 1979
Buku Teks
Tanner, James T., author
Burgess Publishing, 1970
Buku Teks