Alderman, M. Kay (2004) MOTIVATION FOR ACHIEVEMENT. Lawrence Erlbaum Assosiates, Publisher, Mahwah, New Jersey London. ISBN 0-8058-4309-4
Darling, David (2004) THE UNIVERSAL BOOK OF MATHEMATICS FROM ABRACADABRA TO ZENO’S PARADOXES. John Wiley & Sons, Inc., Kanada. ISBN 0-471-27047-4
David, Darling (2004) THE UNIVERSAL BOOK OF MATHEMATICS. by John Wiley & Sons, Inc., Hoboken, New Jersey. ISBN 978-1-118-11776-7
Delfos, Martine F. (2004) CHILDREN AND BEHAVIOURAL PROBLEMS : ANXIETY, AGGRESSION, DEPRESSION AND BIOPSYCHOLOGICAL MODEL WITH GUIDELINES FOR DIAGNOSTICS AND TREATMENT. Jessica Kingsley Publishers, United Kingdom. ISBN 1-84310-196-3
Klarer, Mario (2004) AN INTRODUCTION TO LITERARY STUDIES. Routledge, London. ISBN 0-415-33381-4
Lee, William W (2004) MULTIMEDIA BASED INSTRUCTIONAL DESIGN. jhon Willey and Sons, Inc, America. ISBN 0-7879-7069-7
Mercer, Michael W (2004) HUMAN RESOURCES PLANNING AND RECRUITMENT. All rights reserved, South-Western.
Rabinowitz, Mitchell and Blumberg, Fran C and Everson, Howard T (2004) THE DESIGN OF INTRUCTION AND EVALUATION. Lawrence Erlbaum Assocatiates, New Jersey. ISBN 0-8058-3762-0