For Humulus
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.
Small, E. 1978. A numerical and nomenclatural analysis of morpho-geographic taxa of Humulus. Syst. Bot. 3: 37-76.
Small, E. 1997. Cannabaceae. 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.
Tembrock, L.R., J.M. McAleer, and T.M. Gilligan. 2016. A revision of native North American Humulus (Cannabaceae). J. Bot. Res. Inst. Texas 10: 11-30.
Wu, Zhou, & Bartholomew. In FoC.
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