1. Angier, Bradford. 1972. Feasting Free on Wild Edibles. Stackpole Books, Harrisburg, Pennsylvania.
2. Arctander, Steffen. 1960. Perfumes and Flavor Materials of Natural Origin. Elizabeth, New Jersey.
3. Barton, Benjamin H. 1877. Medicinal Plants of Great Britain. Thomas Castle, London.
4. Bearfoot, Will. 1975. Mother Nature’s Dyes and Fibers. Charles Scribner, New York.
5. Benedict, Ralph C. 1915. “Fern Hats and Fern Cigar Cases.” Amer. Fern J.5: 7–9.