1. A reappraisal of the transfer and retroaction surface;Bugelski;J. exp. Psychol.,1956
2. Meaningful similarity and interference in learning;Osgood;J. exp. Psychol.,1946
3. The similarity paradox in human learning; a resolution;Osgood;Psychol. Rev.,1949
4. Statistical methods;Snedecor,1957
5. An evaluation of the Gibson theory of verbal learning;Underwood,1961