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References
- ↑ University of Wisconsin–Madison. Botany Faculty. Retrieved 22 July 2014.
- ↑ Givnish, Thomas Joseph (1980). Leaf Form in Relation to Environment: A Theoretical Study. OCLC 606050264.
- ↑ American Association for the Advancement of Science (2003). Annual Report, p. 20. Retrieved 22 July 2014.
- ↑ International Plant Names Index. "Givnish, Thomas J."
- ↑ International Plant Names Index. "Givnish". Retrieved 22 July 2014.
