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"Ceitis Occidentalis L." Ceitis Occidentalis L. N.p., n.d. Web. 22 Apr. 2015.

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"Hackberry." Hackberry. N.p., n.d. Web. 22 Apr. 2015.

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"Texas A&M Forest Service - Trees of Texas - List of Trees." Texas A&M Forest Service - Trees of Texas - List of Trees. N.p., n.d. Web. 22 Apr. 2015.

Farrell, William. COMMON HACKBERRY (n.d.): n. pag. Web.

"The Plant List — A Working List for All Plant Species." Ulmaceae. N.p., n.d. Web. 22 Apr. 2015.

"Colorado Tree Coalition." Colorado Tree Coalition. N.p., n.d. Web. 22 Apr. 2015.

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