Hugo, N. R., & Llewellyn, R. J. (2014). Trees up close: The beauty of bark, leaves, flowers, and seeds. Timber Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHugo, Nancy R., और Robert J. Llewellyn. Trees Up Close: The Beauty of Bark, Leaves, Flowers, and Seeds. Portland: Timber Press, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHugo, Nancy R., और Robert J. Llewellyn. Trees Up Close: The Beauty of Bark, Leaves, Flowers, and Seeds. Timber Press, 2014.
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