Porter, Lyman W., author
McGraw-Hill, 1988
Buku Teks
Garcia, Ofelia, author
Wiley-Blackwell , 2009
Buku Teks
Wigmore, Lionel, author
Australian War Memorial, 1957
Buku Teks
Porter-O`Grady, Tim, author
An Aspen Publication , 1986
Buku Teks
Morley, James William, author
Columbia University Press, 1957
Buku Teks