Snedecor, George W., author
The Iowa State University Press, 1982
Buku Teks
Fox, John, author
John Wiley & Sons, 1984
Buku Teks
edited by Glenys Parry and Fraser N. Watts
Routledge, 1996
Buku Teks
Candy, James V
McGraw-Hill, 1986
Buku Teks
Bhattacharyya, Gouri K., author
John Wiley & Sons, 1977
Buku Teks