"Cargill, O. (1952). Selected writings on nature and liberty. Liberal arts press publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र"Cargill, Oscar.ed.;Thoreau. Selected Writings on Nature and Liberty. Liberal arts press publishers, 1952.
एमएलए (9वां संस्करण) प्रशस्ति पत्र"Cargill, Oscar.ed.;Thoreau. Selected Writings on Nature and Liberty. Liberal arts press publishers, 1952.
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