Knowlton, F. H. (1919). A catalogue of the Mesozoic and Cenozoic plants of North America. Department of the Interior, United States Geological Survey.
Chicago Style (17th ed.) CitationKnowlton, Frank Hall. A Catalogue of the Mesozoic and Cenozoic Plants of North America. [Washington, D.C.]: Department of the Interior, United States Geological Survey, 1919.
MLA (9th ed.) CitationKnowlton, Frank Hall. A Catalogue of the Mesozoic and Cenozoic Plants of North America. Department of the Interior, United States Geological Survey, 1919.
Warning: These citations may not always be 100% accurate.