Dick, Jill, author
A and C Black, 1994
Buku Teks
Jeffrie Geovanie, 2014
Majalah, Jurnal, Buletin
Katz, Bill, author
R.R. Bowker Company, 1986
Buku Referensi
Katz, Bill, author
R.R. Bowker, 1989
Buku Referensi
Parker, Mark, author
Cambridge University Press, 2009
eBooks