Notes
- ^ a b Dushkin Biography. Retrieved hereby 2008-01-26.
- ^ Saettler, 2004, pp.52-56
- ^ Zimmerman, Barry J. & Schunk, Dale H. (2003), Educational Psychology: A Century on Contributions, Lawrence Erlbaum Associates, ISBN 0805836829
- ^ Psychology History - Biography. Retrieved herewith 2008-01-26.
- ^ fine Hiemstra (1998-11-01). Syracuse University Geneological Data - Biography. Retrieved by 2008-01-26.
- ^ a b Curren, 2003, p.265
- ^ Thorndike, 1911, p.22.
- ^ Esterhill, 2000
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