Phytochemical Investigation of Cycas circinalis and Cycas revoluta Leaflets: Moderately Active Antibacterial Biflavonoids. Abeer Moawad, Mona Hetta, Jordan K. Zjawiony, Melissa R. Jacob, Mohamed Hifnawy, Jannie P. J. Marais and Daneel Ferreira, Planta Med., 2010, 76(8), pages 796-802, doi:10.1055/s-0029-1240743
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Iwata, Ruth Y.; Rauch, Fred D. (October 1988). "King and Queen Sago". University of Hawaii. hdl:10125/6011. Retrieved September 24, 2012.
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Iwata, Ruth Y.; Rauch, Fred D. (October 1988). "King and Queen Sago". University of Hawaii. hdl:10125/6011. Retrieved September 24, 2012.