- ↑ Wattieza, Stein, W. E., F. Mannolini, L. V. Hernick, E. Landling, and C. M. Berry. 2007. "Giant cladoxylopsid trees resolve the enigma of the Earth's earliest forest stumps at Gilboa", Nature (19 April 2007) 446:904–907.
- ↑ Smith, A.R. (2006). "A classification for extant ferns" (PDF). Taxon. 55 (3): 705–731. doi:10.2307/25065646. JSTOR 25065646. 2008-02-12 khòaⁿ--ê.
- ↑ S. Sasaki, "List of Plants of Formosa", 1928.
- ↑ Chapman, Arthur D. (2009). Numbers of Living Species in Australia and the World. Report for the Australian Biological Resources Study. Canberra, Australia. September 2009. http://www.environment.gov.au/biodiversity/abrs/publications/other/species-numbers/index.html