Newby, Michael, author
Cambridge University Press, 1988
Buku Teks
Woods, Geraldine, author
John Wiley & Sons, 2015
Buku Teks
Anderson, W.M. (Wendy M.), author
Wiley Publishing , 2013
Buku Teks
Woods, Geraldine, author
John Wiley & Sons, 2016
Buku Teks
House, C. Homer, author
Prentice-Hall, 1950
Buku Teks