For Celtis
Hayes, A., S. Wang, A.T. Whittemore, and T.W. Smith. 2022. The genetic diversity of triploid Celtis pumila and its diploid relatives C. occidentalis and C. laevigata (Cannabaceae). Syst. Bot. 47(2): 441-451.
Henrickson, J. 2010. Comments on a revision of Celtis subgenus Mertensia (Celtidaceae) and the recognition of Celtis pallida. J. Bot. Res. Inst. Texas 4: 287-293.
Sherman-Brotles, S.L., W.T. Barker, and L.M. Schultz. 1997. Ulmaceae. In Flora of North America Editorial Committee. 1997. Flora of North America north of Mexico. Volume 3, Magnoliophyta: Magnoliidae and Hamamelidae. Oxford Univ. Press, New York, NY. 590 pp.
Todzia. 1993. In Kubitzki, K., J.G. Rohwer, and V. Bittrich, eds. 1993. The families and genera of vascular plants. II. Flowering plants – Dicotyledons – Magnoliid, Hamamelid and Caryophyllid families. Springer, Berlin. 653 pp.
Whittemore. 2013. In Yatskievych, G. 2013. Steyermark’s flora of Missouri. Volume 3. Missouri Bot. Garden Press, St. Louis, MO. 1382 pp.
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