« Species records of Manfreda » [archive du ], Germplasm Resources Information Network, sur Germplasm Resources Information Network, United States Department of Agriculture (consulté le )
Flora of North America Editorial Committee, Flora of North America North of Mexico (2002). Oxford University Press, New York, Oxford., http://floranorthamerica.org/cite
P.F. Stevens, Angiosperm Phylogeny Website: Asparagales: Agavoideae (lire en ligne)
web.archive.org
« Species records of Manfreda » [archive du ], Germplasm Resources Information Network, sur Germplasm Resources Information Network, United States Department of Agriculture (consulté le )