Cowden, Dudley J.
Prentice-Hall, 1957
Buku Teks SO
Chaudhuri, Arijit
Chapman and Hall/CRC, 2005
Buku Teks SO
Barnett, Vic
Arnold , 2002
Buku Teks SO
Tryfos, Peter
John Wiley & Sons, 1996
Buku Teks SO
Fleiss, Joseph L.
John Wiley & Sons, 1983
Buku Teks SO