Odkazy
Cycadophyta - cykasorosty
Stevenson, D. W. (1992): A Formal Classification of the Extant Cycads. [s.l.]
Brittonia Vol. 44, no.2, p. 220-23 
Vytopil J.: Haynes, J. L. (2006): Historical Review of the World List of Cycads
Unpublished. 37 pp. http://www.iucn.org/themes/ssc/sgs/csg/publicat...
Hill K. D., Stevenson D. W., Osborne R. (2004): The world list of cycads
Pp. 195-212, In: J.A. Lindström (ed.), Proceedings of the Sixth International Conference on Cycad Biology (CYCAD 2002). Nong Nooch Tropical Garden, Pattaya, Thailand. http://www.iucn.org/themes/ssc/sgs/csg/publicat...
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