Freund, E. H. (1971). The ground of evil-doing: An inquiry into the limits of man's power to act. Christopher Pub. House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFreund, Ernest Hans. The Ground of Evil-doing: An Inquiry into the Limits of Man's Power to Act. North Quincy, Mass.: Christopher Pub. House, 1971.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFreund, Ernest Hans. The Ground of Evil-doing: An Inquiry into the Limits of Man's Power to Act. Christopher Pub. House, 1971.
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