Castle, William S., and James J. Ferguson. 2003. “Early-Maturing Sweet Oranges: Research Update on Earlygold, Itaborai, Ruby, and Westin Sweet Oranges: HS920/HS173, 5/2003”. EDIS 2003 (10). Gainesville, FL. https://doi.org/10.32473/edis-hs173-2003.