Landau, Cecile and O’Hara, Scarlett, eds. (2012) The Psychology Book :Big Ideas Simply Explained. Dorling Kindersley Limited, United States. ISBN 978-0-7566-8970-4

Jones, Steve and Forshaw, Mark (2012) Psychology Express Research Methods in Psychology. Pearson Education Limited, England. ISBN 978-0-273-73725-4

Morling, Beth (2012) Research Methods in Psychology, 4th ed. W.W. NORTON & COMPANY, USA. ISBN 978-0-393-53630-0

Shaughnessy, John J. and Zechmeister, Eugene B. and Zechmeister, Jeanne S. (2012) Research methods in psychology (2). Michael Sugarman, New York. ISBN 978-0-07-803518-0

Spector, Paul E. (2012) Industrial and organizational psychology: research and practice. Wiley, Hoboken, N.J. ISBN 978-0-470-94976-4