Palastanga, Nigel
Churchill Livingstone, 2012
Buku Teks
edited by Carie Sussman, Barbara M. Bates-Jensen
AN Aspen , 1998
Buku Teks
McClintic, J. Robert
John Wiley & Sons, 1976
Buku Teks
Cunningham, Daniel John
Oxford University Press, 1957
Buku Teks
Martini, Frederic H.
Prentice-Hall, 2001
Buku Teks