Murdoch, Iris, author
Routledge Classics , 2001
Buku Teks
National Academy Press, 1996
Buku Teks
Glusberg, Jorge
London: Academy Group, 1988
Buku Teks
Tucker, Glenn
The Bobbs-Merrill Co., 1956
Buku Teks
editor, C.H. Chen
Imperial College Press, 2010
Buku Referensi