Murphy, A. (1994). Graced by pines: The Ponderosa pine in the American West. Mountain Press Pub. Co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMurphy, Alexandra. Graced by Pines: The Ponderosa Pine in the American West. Missoula, Mont.: Mountain Press Pub. Co., 1994.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMurphy, Alexandra. Graced by Pines: The Ponderosa Pine in the American West. Mountain Press Pub. Co., 1994.
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