Bitter, Gary G., author
Allyn and Bacon, 1989
Buku Teks
Wheeler, Ruric E., author
Brooks/Cole, 1967
Buku Teks
Wheeler, Ruric E., author
Brooks/Cole, 1970
Buku Teks
Wheeler, Ruric E., author
Brook/Cole, 1969
Buku Teks
Willson, Jack D.
McGraw-Hill , 1967
Buku Teks