Hitch, Charles J., author
University of California Press, 1965
Buku Teks
Greenwood, Ted, 1944-, author
Ballinger, 1975
Buku Teks
Hernon, Peter, author
Ablex, 1990
Buku Teks
Fishburn, Peter C., author
John Wiley & Sons, 1970
Buku Teks
edited by Maureen D. Raynor, Jayne E. Marshall and Amanda Sullivan
Elsevier, 2005
Buku Teks