Daykin, C.D., author
Chapman & Hall, 1994
Buku Teks
Muzos, Steven J.
Harper Collins College, 1992
Buku Teks
Hoghton Mifflin, 1968
Buku Teks
Kermode, Frank, author
Oliver and Boyd, 1960
Buku Teks
Cousins, Albert N., 1919-, author
John Wiley & Sons, 1979
Buku Teks