Atkinson, A. C., author
Clarendon Press, 1992
Buku Teks
Cochran, William G., author
John Wiley & Sons, 1959
Buku Teks
Kirsch, Uri, author
McGraw-Hill , 1981
Buku Teks
Freund, John E., author
Prentice-Hall, 1960
Buku Teks
Campbell, Donald T., author
Rand Mc Nally College Publisher, 1966
Buku Teks