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Introduction to California Plant Life, Robert Ornduff, Phyllis M. Faber, Todd Keeler-Wolf, California Natural History Guides No. 69, University of California Press, Ltd., 2003, ISBN978-0-520-23704-9, pages 114, 138–9
Santa Margarita River Recharge and Recovery Enhancement Program, United States Bureau of Reclamation,
Biological Resources Report, Elder and Plunge Creek Project, San Bernardino County Department of Public Works Environmental Management Division,
Placer County Natural Resources Report, Chapter 2: Methods, 2004