Russell, Bertrand, 1872-1970, author
George Allen and Unwin, 1956
Buku Teks
Craig, Robert T., author
Prentice-Hall, 1969
Buku Teks
Barker, Forrest, author
Prentice-Hall, 1989
Buku Teks
Armstrong, James W., author
Macmillan, 1976
Buku Teks
Campbell, Hugh G., author
Macmillan, 1974
Buku Teks