Hult, R. E. (1989). An Olympic mountain enchantment: An interlude at Humes Ranch with wildlife photographer Herb Crisler, 1949-1950. CP Publications.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHult, Ruby El. An Olympic Mountain Enchantment: An Interlude at Humes Ranch with Wildlife Photographer Herb Crisler, 1949-1950. Port Angeles, WA: CP Publications, 1989.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHult, Ruby El. An Olympic Mountain Enchantment: An Interlude at Humes Ranch with Wildlife Photographer Herb Crisler, 1949-1950. CP Publications, 1989.
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