Forthofer, Ron N., 1944-
Lifetime Learning Publications, 1981
Buku Teks
edited by L. Andries van der Ark, Marcel A. Croon and Klaas Sijtsma
Lawrence Erlbaum Associates, 2005
Buku Teks SO
Agresti, Alan
John Wiley & Sons, 1984
Buku Teks SO
Fienberg, Stephen E.
Massachusett Institute of Technology, 1980
Buku Teks SO
Le, Chap T., 1948-
Wiley, 2010
Buku Teks SO