ZEIG, JEFFREY K. & MUNION, W. MICHAEL, 1999, Milton H. Erickson, SAGE PUBLICATIONS LTD., LONDON

ZIMBARDO, PHILIP & EBBESEN, EBBE B., 1970, Infl uencing attitudes and changing behavior, ADDISONWESLEY PUBLISHING COMPANY, MASSACHUSETTS

ZIMBARDO, PHILIP, 2007, The Lucifer Effect: Understanding how good people turn evil, RANDOM HOUSE, NEW YORK