USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN) [Base de Dados DisponÃvel na Internet]. National Germplasm Resources Laboratory, Beltsville, Maryland. Cycas segmentifidaArquivado em 9 de fevereiro de 2010, no Wayback Machine. (8 de Abril de 2010)
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USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN) [Base de Dados DisponÃvel na Internet]. National Germplasm Resources Laboratory, Beltsville, Maryland. Cycas segmentifidaArquivado em 9 de fevereiro de 2010, no Wayback Machine. (8 de Abril de 2010)