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