Here is a list of helpful print and electronic materials:
Biographical Dictionary of Psychology - edited by Noel Sheehy, Antony J. Chapman, Wendy A. Conroy - eBook
Fifty Key Thinkers in Psychology - by Noel Sheehy - eBook
A Guide to Psychologists & their Concepts - by Vernon Nordby - BF109.A1 N67
Great Psychologists and their Times: Scientific Insights into Psychology's History - by Dean Keith Simonton - BF109.A1S56 2002
Some resources for finding background information on people: