Não informado. (1968). Philosophy and History. Institute for Scientific Co-operation.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Philosophy and History. Tubingen, Alemanha: Institute for Scientific Co-operation, 1968.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Philosophy and History. Institute for Scientific Co-operation, 1968.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.