Spadaccini, Michael, author
Ep Entrepreneuir Press, 2011
Buku Teks
Gosselin, Chantal, author
Vermilion, 1995
Buku Referensi
Sparrow, Giles, 1970-, author
Quercus, 2014
Buku Referensi
Mason, Peter, author
Routledge, 1998
Buku Teks
Derfler, Frank J., author
Ziff-Davis Press, 1992
Buku Teks