Poelker, R. J., & Hartwell, H. D. (1973). Black bear of Washington: Its biology, natural history, and relationship to forest regeneration. Washington State Game Dept..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPoelker, Richard J., और Harry D. Hartwell. Black Bear of Washington: Its Biology, Natural History, and Relationship to Forest Regeneration. Olympia: Washington State Game Dept., 1973.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPoelker, Richard J., और Harry D. Hartwell. Black Bear of Washington: Its Biology, Natural History, and Relationship to Forest Regeneration. Washington State Game Dept., 1973.
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