edited by Anthony G. McGrew
Manchester University Press, 1985
Buku Teks
edited by Glendon Schubert
Free Press, 1963
Buku Teks
Radford, K.J., author
Phoenix Press, 1981
Buku Teks
Cooper, Joseph D., author
Doubleday, 1961
Buku Teks
Fishburn, Peter C., author
John Wiley & Sons, 1970
Buku Teks