Não informado. (1968). Philosophy and History. Institute for Scientific Co-operation.
Chicago-Zitierstil (17. Ausg.)Não informado. Philosophy and History. Tubingen, Alemanha: Institute for Scientific Co-operation, 1968.
MLA-Zitierstil (8. Ausg.)Não informado. Philosophy and History. Institute for Scientific Co-operation, 1968.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.