

 Bower, G.H. (1973). "How to .... uh .... remeber!" Psychology Today, 63-70.

 Bourne, L.E., Dominowski, R.L., Loftus, E.F., and Healy, A.F. (1986).
        Cognitive Processes (Ch. 4, pp. 98-101). Prentice Hall: New Jersey.

 Gilhooly K.J., and Logie R.H. (1980). "Age-of-acquisition, imagery,
        concreteness, familiarity, and ambiguity measures for 1,944 words",
        Behavior Research Methods & Instrumentation, Vol. 12 (4), 395-427.
