Fuller, Lon L., author
Yale University Press, 1974
Buku Teks
Fuller, Lon L., author
Yale University Press, 1964
Buku Teks
Dow, Hume
Oxford University Press, 1971
Buku Teks
Mossner, Ernest Campbell, author
Columbia University Press, 1943
Buku Teks
edited by David Boucher and Paul Kelly
Routledge, 1998
Buku Teks