Conover, W.J., author
Wiley, 1983
Buku Teks
Hamilton, Robert W., author
Little, Brown , 1989.
Buku Teks
Lapin, Lawrence L., author
Harcourt Brace Jovanovich, 1990
Buku Teks
Lapin, Lawrence L., author
Harcourt Brace Jovanovich, 1978
Buku Teks
Rosenblatt, S. Bernard, author
Houghton Mifflin, 1973
Buku Teks