Theirauf, Robert J.
Prentice-Hall, 1975
Buku Teks
Saldarini, Robert A.
Macmillan Publishing Company, 1990
Buku Teks
Saldarini, Robert A.
Macmillan Publishing Company, 1989
Buku Teks
Li, David H., author
Science Research Associates, 1972
Buku Teks
Senn, James A., author
McGraw-Hill , 1984
Buku Teks