Quercus ellipsoidalis (Northern Pin Oak)
- Physical description, habitat, and range. Includes an image of leaves.
- http://www.enature.com/partners/nwf/showSpeciesLG_nwf.asp?familyName=&shapeName=&curFamilyID=&showType=4&rgnID=1599&curGroupID=10&curPageNum=159&recnum=TS0630

Quercus ellipsoidalis
- Facts on physical characteristics, habitat, and range. Provides distribution map.
- http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=233501027