Foster, Gertrude B. and Rosemary F. Louden. Park's Success with Herbs. Greenwood, S. C.: G. W. Park Seed Co., 1980.
Grieve, M. A Modern Herbal: The Medicinal, Culinary, Cosmetic and Economic Properties, Cultivation and Folk-lore of Herbs, Grasses, Fungi, Shrubs, & Trees with All Their Modern Scientific Uses. New York: Harcourt, Brace and Co., 1931.
Reader's Digest Editors. Magic and Medicine of Plants. Pleasantville, N.Y.: Reader's Digest Association, 1986.
Simon, James E., Alena F. Chadwick and Lyle E. Craker. Herbs: An Indexed Bibliography, 1971-1980: The Scientific Literature on Selected Herbs, and Aromatic and Medicinal Plants of the Temperate Zone. Hamden, Conn.: Archon Books, 1984.
Tuckler, V., et al. "Seizure in an Infant from Aniseed Oil Toxicity." Clinical Toxicology (August 2002): 689.