<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">Ausubel, David P.</hi> (1960): "The use of advance organizers in the learning and retention of meaningful verbal material", in: <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Journal of Educational Psychology</hi> 51: 267-272.