Ruse, Michael
Cambridge University Press, 2012
Buku Teks
Keith, Arthur Berriedale, 1879-1944
Watts & Co., 1947
Buku Teks
Keith, Arthur, Sir
Watts & Co., 1950
Buku Teks
Winston, Robert
BBC Worldwide Limited, 2004
Multimedia
Winston, Robert
BBC Worldwide Limited, 2004
Multimedia