Elpel, T. J. (2004). Botany in a day: The patterns method of plant identification : Thomas J. Elpel's herbal field guide to plant families (Revised and expanded fifth edition.). HOPS Press.
Chicago Style (17th ed.) CitationElpel, Thomas J. Botany in a Day: The Patterns Method of Plant Identification : Thomas J. Elpel's Herbal Field Guide to Plant Families. Revised and expanded fifth edition. Pony, Mont.: HOPS Press, 2004.
MLA (9th ed.) CitationElpel, Thomas J. Botany in a Day: The Patterns Method of Plant Identification : Thomas J. Elpel's Herbal Field Guide to Plant Families. Revised and expanded fifth edition. HOPS Press, 2004.
Warning: These citations may not always be 100% accurate.