Wike, E. L. (1966). Secondary reinforcement: Selected experiments. Harper & Row.
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Chicago-čujuhus (17. p.)
Wike, Edward L. Secondary Reinforcement: Selected Experiments. New York: Harper & Row, 1966.
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MLA-čujuhus (9. p.)
Wike, Edward L. Secondary Reinforcement: Selected Experiments. Harper & Row, 1966.
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