Cambridge School Dictionary
Cambridge University Press
International Encyclopedia of the Social Sciences, 2nd Edition
William A. Darity Jr.
The Encyclopedia of World Cultures: South America
Yale University Staff
Die Kraft der Mitfuehlenden Kommunikation
Mark Robert Waldman & Andrew B. Newberg
Enemies of the State
M. J. Trow
Das Kind in Dir Muss Heimat Finden
Stefanie Stahl