Farkas, Beata, author
Palgrave Macmillan, 2016
Buku Teks
by Robert Bartley [and others]
ISEAS, 1994
Buku Teks
Jens Damm
VS Verlag, 2012
eBooks
edited by Pieter J.D. Drenth, Joseph A. Sergeant, Roelf J. Takens
John Wiley & Sons, 1990
Buku Teks
edited by D.R. Rutter, and Lyn Quine
Avebury, 1994
Buku Teks