"Genus: Zamia L."Germplasm Resources Information Network. United States Department of Agriculture. 2007-10-05. Archived from the original on 2009-08-27. Retrieved 2011-01-12.
"Genus: Zamia L."Germplasm Resources Information Network. United States Department of Agriculture. 2007-10-05. Archived from the original on 2009-08-27. Retrieved 2011-01-12.