Mattessich, Richard, author
Richard D. Irwin, 1964
Buku Teks
Watson, Hugh J., author
John Wiley & Sons, 1981
Buku Teks
Allen, M.P., author
Oxford University Press, 1987
Buku Teks
Duke University Press, 1969
Buku Teks
Patton, William E., author
South-Western, 1992
Buku Teks