Wilson, Arnold T., author
George Allen and Unwin, 1959
Buku Teks
Bonner, Thomas Neville, author
Prentice-Hall, 1963
Buku Teks
Clifford, James, 1945-, author
Harvard University Press, 1988
Buku Teks
Proctor, George A.
University of Toronto Press, 1980
Buku Teks
edited by Robert Benewick and Philip Green
Routledge , 1992
Buku Teks