Hardle, Wolfgang Karl, author
Springer , 2012
eBooks
Morrison, Donald F., author
Prentice-Hall, 1983
Buku Teks
Stevens, James, author
Lawrence Erlbaum Associates, 1986
Buku Teks
Lebart, Ludovic
John Wiley & Sons, 1984
Buku Teks
Twisk, Jos W.R., author
Cambridge University Press, 2006
Buku Teks