University of Florida, Institute of Food and Agricultural Sciences (2014) External factsheets, University of Florida, 3 pp., English language
Allen, T. W., Martinez, A., Burpee, L. L. (2009) External factsheets, APSnet, Spanish language
Allen, T. W., Martinez, A., Burpee, L. L. (2004) External factsheets, APSnet, English language