Snellen, I.Th.M., author
The Hague : Eleven International Publishing, 2014
Buku Teks
edited by Peter Taylor-Gooby
Oxford University Press, 2013
Buku Teks
edited by Dawn E. Holmes, Lakhmi C. Jain
Springer-verlag, 2012
eBooks
Edited by John Hogan, Michael Howlett
Palgrave Macmillan, 2015
Buku Teks
Cohen, Felix S.
Cornell University Press, 1959
Buku Teks