Knowlton, F. H., & Berry, E. W. (1930). The flora of the Denver and associated formations of Colorado. United States Department of the Interior, Geological Survey.
Chicago Style (17th ed.) CitationKnowlton, Frank Hall, and Edward Wilber Berry. The Flora of the Denver and Associated Formations of Colorado. Washington: United States Department of the Interior, Geological Survey, 1930.
MLA (9th ed.) CitationKnowlton, Frank Hall, and Edward Wilber Berry. The Flora of the Denver and Associated Formations of Colorado. United States Department of the Interior, Geological Survey, 1930.
Warning: These citations may not always be 100% accurate.