Crampton, Jeremy W., author
Wiley-Blackwell, 2010
Buku Teks
Karen Elizabeth Bishop, editor
Routledge, 2016
Buku Teks
Zentai, Laszlo, editor
Springer, 2012
eBooks
Tomlin, Dana C., author
Prentice-Hall, 1990
Buku Teks
Monmonier, Mark S., author
The University of Chicago Press, 1993
Buku Teks