The document references three sources about careers in psychology: 1) The Bureau of Labor Statistics' Occupational Outlook Handbook from 2010-2011 which provides information about the career of psychologists. 2) An article by Chester Levine exploring career information from the 2010-2011 BLS edition. 3) A book from 2007 by T.L. Kuther and R.D. Morgan about career opportunities in psychology in a changing world.