Ayer, A. J. (Alfred Jules), 1910-1989, author
Freeman, Coope, 1968
Buku Teks
Roberts, Don D.
Mouton, 1973
Buku Teks
Gallie, W.B., author
Middlesex, Penguin Books, 1952
Buku Teks
Schwartz, Robert, 1940-, author
Wiley Blackwell, 2015
Buku Teks
Symons, Julian, author
Arthur Barker, 1951
Buku Teks