Hernon, Peter
Ablex, 1990
Buku Teks
Fishburn, Peter C.
John Wiley & Sons, 1970
Buku Teks
edited by Maureen D. Raynor, Jayne E. Marshall and Amanda Sullivan
Elsevier, 2005
Buku Teks
Zimmerman, Jerold L., 1947-
McGraw-Hill, 2003
Buku Teks
edited by Hermann Brandstatter
Academic Press, 1982
Buku Teks