Taket, Ann
John Wiley & Sons, 2000
Buku Teks
Hernon, Peter
Ablex, 1990
Buku Teks
Fishburn, Peter C.
John Wiley & Sons, 1970
Buku Teks
Zimmerman, Jerold L., 1947-
McGraw-Hill, 2003
Buku Teks
edited by Hermann Brandstatter
Academic Press, 1982
Buku Teks