Skinner, B. F. (1 January 1948). "'Superstition' in the pigeon.". Journal of Experimental Psychology. 38 (2): 168–172. doi:10.1037/h0055873. PMID18913665
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Skinner, B. F. (1 January 1948). "'Superstition' in the pigeon.". Journal of Experimental Psychology. 38 (2): 168–172. doi:10.1037/h0055873. PMID18913665