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  1.  31
    Understanding covert recognition.A. Mike Burton, Andrew W. Young, Vicki Bruce, Robert A. Johnston & Andrew W. Ellis - 1991 - Cognition 39 (2):129-166.
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  2.  18
    Secondary reinforcement measured with unrelated responses in training and testing.Jon E. Jonsson, Herbert Friedman & Robert A. Johnston - 1984 - Bulletin of the Psychonomic Society 22 (4):359-361.
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  3. Great Christian Plays.Theodore MacLean Switz & Robert A. Johnston - 1956
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