References:

Chamberlain, C. J. (1965). The living cycads. New York: Hafner Publishing Company.

Giddy, C. (1974). Cycads of South Africa. Cape Town: Purnell and Sons.

Jones, D. L. (2002). Cycads of the world: Ancient plants in today’s landscape, 2^nd ed. Washington, DC: Smithsonian Institution. Press.

Naskrecki, P. (2011). Relics: Travels in nature’s time machine. Chicago: University of Chicago Press.

New South Wales Government, Royal Botanical Gardens and Domain Trust. (2012). Cycas revoluta. In The cycad pages. Retrieved February 28, 2013, from http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/cycadpg?taxname=Cycas+revoluta

U.S. Department of Agriculture, Natural Resources Conservation Service. (2013). Cycas   revoluta. In The PLANTS database. Retrieved February 28, 2013, from http://plants.usda.gov/java/profile?symbol=Cyre11