Zeitschrift fur Psychologie, 1909: Herman Ebbinghaus.
Licence: In copyright
Credit: Zeitschrift fur Psychologie, 1909: Herman Ebbinghaus. Wellcome Collection. Source: Wellcome Collection.
Licence: In copyright
Credit: Zeitschrift fur Psychologie, 1909: Herman Ebbinghaus. Wellcome Collection. Source: Wellcome Collection.