Sigel, Andrew F.
John Wiley & Sons, 1996
Buku Teks SO
Devore, Jay L.
Duxbury Press, 1995
Buku Teks SO
Robert, Harry V.
McGraw-Hill, 1982
Buku Teks SO
Mosteller, Frederick
Addison Wesley Publ., 1983
Buku Teks SO
Whitehead, Paul
Pitman, 1992
Buku Teks SO