How to Cite "Phylum Sphenophyta: Horsetails" from CliffsNotes.com:

CliffsNotes.com. Phylum Sphenophyta: Horsetails. 21 Sep 2014
<http://www.cliffsnotes.com/sciences/biology/plant-biology/seedless-vascular-plants/phylum-sphenophyta-horsetails>.



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