Kirkwood, J. E. (1930). Northern Rocky Mountain trees and shrubs. Stanford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKirkwood, J. E. Northern Rocky Mountain Trees and Shrubs. Stanford University, Calif.: Stanford University Press, 1930.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKirkwood, J. E. Northern Rocky Mountain Trees and Shrubs. Stanford University Press, 1930.
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