
  Original study was reported in: 

    Sperling, G. (1960). The information available in brief visual 
        presentations. Psychological Monographs, 74, 1-29. 

  See also:
    
    Sperling, G. (1963). A model for visual memory tasks. Human Factors,
        5, 19-31.

  The topic of sensory and iconic memory is discussed in most cognitive
  psychology textbooks. 
   
   Bourne, L.E., Dominowski, R.L., Loftus, E.F., and Healy, A.F. (1986).
        Cognitive Processes (Ch. 2.). Prentice Hall: New Jersey.

   Solso, R.L. (1991). Cognitive Psychology (Ch. 3.). Allyn and Bacon: 
        Boston.

   Dodd, D.H., and White, R.M. (1980). Cognition: Mental structures
        and processes (Ch. 3.). Allyn and Bacon: Boston. 
