Nunnally, Stephen. W., 1927-
Prentice-Hall, 1993
Buku Teks
Woodward, J. F.
Macmillan, 1975
Buku Teks
Paterson, John
John Wiley & Sons, 1977
Buku Teks
Wass, Alonzo
Reston, VA: Reston Publishing, 1973
Buku Teks
Fellows, Richard, 1948-,author
John Wiley and Sons, Inc. , 2015
Buku Teks