Report: Definitions and delimitations of psychological terms prepared by a committee of the American Psychological Association

Howard C. Warren, Mary W. Calkins, Knight Dunlap, H.N. Gardiner, Christian A. Ruckmich
1918 Psychological bulletin  
doi:10.1037/h0073461 fatcat:hd5pknvqbrgi7deu5cyr6rix3u