References
W. James, Principles of Psychology, i., 1890, chs. iv., xiv.; F. H. Bradley, The Principles of Logic, 1883, 273 ff.; H. Ebbinghaus, Memory, trs. H. A. Ruger and C. E. Bussenius, 1913; C. S. Myers, A Text-book of Experimental Psychology, i., 1911, chs. xii., xiii.; O. Kuelpe, Outlines of Psychology, 1909, 169 ff.; E. B. Titchener, A Text-book of Psychology, 1910, 374 ff.; M. Offner, Mental Fatigue, trs. G. M. Whipple, 1911; E. L. Thorndike, Educational Psychology, ii., 1913; E. Meumann, The Psychology of Learning, trs. J. W. Baird, 1913.