Cuba, George S.
Standard catalog of world paper money : modern issues, 1961-present
Krause, 2008
 Multimedia
Standard catalog of world coins: 1601-1700
George S. Cuhaj, editor
Krause, 2011
 Buku Referensi
Rodrigues, Dawn
The research paper and the world wide web
Prentice-Hall, 2000
 Buku Teks
Dilemmas of world politics: international issues in a changing world
edited by John Baylis and N.J. Rengger
Clarendon Press , 1992
 Buku Teks
Olson, David R.
The world on paper : the conceptural and cognitive implications of writing and reading
Cambridge University Press , 1994
 Buku Teks