Raz, Joseph
Clarendon Press, 1970
Buku Teks
Wesley-Smith, Peter, author
Oxford University Press, 1987
Buku Teks
Johnson, Edward Lea, author
Methuen, 1969
Buku Teks
Mermin, Samuel, author
Little, Brown, 1982
Buku Teks
Wu, Min Aun, author
Heinemann Educational Books, 1975
Buku Teks