Finney, D.J.
John Wiley & Sons, 1953
Buku Teks
Mead, R., author
Chapman & Hall, 1993
Buku Teks
Snedecor, George W., author
The Iowa State University Press, 1962
Buku Teks
Edwards, Allen L.
Holt, Rinehart and Winston, 1964
Buku Teks
Dixon, Wilfrid J. (Wilfrid Joseph), author
McGraw-Hill, 1969
Buku Teks