Norstog, Knut and Nicholls, Trevor J.. "1. General Features, Genera, and Relationships".
The Biology of the Cycads, Ithaca, NY: Cornell University Press, 1998, pp. 1-32.
https://doi.org/10.7591/9781501737329-002
Norstog, Knut and Nicholls, Trevor J.. "1. General Features, Genera, and Relationships" In
The Biology of the Cycads, 1-32. Ithaca, NY: Cornell University Press, 1998.
https://doi.org/10.7591/9781501737329-002
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