<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">Cunningham, Hamish / Maynard, Diana / Bontcheva, Kalina</hi> (2011): <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Text Processing with GATE</hi> (Version 6). University of Sheffield Department of Computer Science. ISBN 0956599311.