editor by Benjamin B. Wolman
New York : Van Nostrand Reinhold Company, 1977,
Buku Referensi
Gelder, Michael, author
Oxford University Press, 1983
Buku Teks
Winokur, George, author
W.B. Saunders, 1986
Buku Teks
Nietzel, Michael T., author
Prentice-Hall, 1998
Buku Teks
Noyes, Arthur P.
W.B. Saunders , 1958
Buku Teks