"The mission of the APA [American Psychological Association] is to advance the creation, communication and application of psychological knowledge to benefit society and improve people’s lives"; APA (2010). About APA. Retrieved 20 October 2010.
bls.gov
Bureau of Labor Statistics, U.S. Department of Labor, Occupational Outlook Handbook, 2010–11 Edition, Psychologists, on the Internet at bls.govΑρχειοθετήθηκε 2012-01-04 στο Wayback Machine. (visited July 08, 2010).
Bureau of Labor Statistics, U.S. Department of Labor, Occupational Outlook Handbook, 2010–11 Edition, Psychologists, on the Internet at bls.govΑρχειοθετήθηκε 2012-01-04 στο Wayback Machine. (visited July 08, 2010).
