Die Vorsokratiker / Olof Gigon. - Gigon, Olof Alfred, 1912- (OLS)http://pul/name/631 (de Gruyter, 1972)
IAR: CFA.157

Persons : human and divine / edited by Peter van Inwagen and Dean Zimmerman. - Zimmerman, Dean W. (OLS)http://pul/name/54284; Van Inwagen, Peter. (OLS)http://pul/name/66712 (Clarendon Press, 2007)