- "Zenobia," in The New International Encyclopædia, New York: Dodd, Mead and Co. (1905)
- "Zenobia," in Collier's New Encyclopedia, New York: P. F. Collier & Son Co. (1921)
- "Zenobia," in Encyclopædia Britannica (11th ed., 1911)
- "Zenobia," in The New Student's Reference Work, Chicago: F.E. Compton and Co. (1914)
- "Zenobia," in The Encyclopedia Americana, New York: The Encyclopedia Americana Corporation (1920)
See also Zenobia of Palmyra.