Chadwick, D. H. (2021). Four fifths a grizzly: A new perspective on nature that just might save us all (Hardcover edition.). Patagonia Works.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रChadwick, Douglas H. Four Fifths a Grizzly: A New Perspective on Nature That Just Might Save Us All. Hardcover edition. Ventura, California: Patagonia Works, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रChadwick, Douglas H. Four Fifths a Grizzly: A New Perspective on Nature That Just Might Save Us All. Hardcover edition. Patagonia Works, 2021.
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