Roberts, Don D.
Mouton, 1973
Buku Teks
Ayer, A. J. (Alfred Jules), 1910-1989, author
Freeman, Coope, 1968
Buku Teks
Gallie, W.B., author
Middlesex, Penguin Books, 1952
Buku Teks
Symons, Julian, author
Arthur Barker, 1951
Buku Teks
Fielding, K.J., author
Longman, Green, 1953
Buku Teks