Schriften der Gesellschaft für Psychologische Forschung
- 1.1891–5.189 Harvard = Google, Chicago = Google, Wisconsin = Google, New York = Google
- 6.1893–10.1897 Wisconsin = Google, California = Google, New York = Google
- 11.1891–15.1905 Wisconsin = Google, California = Google, New York = Google
- 16.1906–20.1916 Wisconsin = Google
- 16–17 California = Google
- 18–20 California = Google