Shapiro, Edward, author
Harcourt Brace Jovanovich, 1978
Buku Teks
Lindauer, John, author
Free Press, 1968
Buku Teks
McCandless, George T., author
Prentice-Hall, 1991
Buku Teks
Fisher, Irving Norton
Cornet Press Books, 1956
Buku Teks
Box, John Fisher
John Wiley & Sons, 1978
Buku Teks