Myers, Thomas W., author
Churchill Livingstone, 2001
Buku Teks
Palastanga, Nigel, author
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, author
Oxford University Press, 1957
Buku Teks