For Kickxia
Elisens, W.J. 2019b. Kickxia. In Flora of North America Editorial Committee. 2019. Flora of North America north of Mexico. Volume 17, Magnoliophyta: Tetrachondraceae to Orobanchaceae. Oxford Univ. Press, New York, NY. 737 pp.
Ghebrehiwet, M. 2000. Taxonomy, phylogeny and biogeography of Kickxia and Nanorrhinum (Scrophulariaceae). Nord. J. Bot. 20: 655-690.
Pennell, F.W. 1935. The Scrophulariaceae of eastern temperate North America. Academy of Natural Sciences of Philadelphia Monograph No. 1.
Sutton, D.A. 1988. A revision of the tribe Antirrhineae. British Museum (Natural History), Oxford Univ. Press, London.
Yousefi, N., S. Zarre, and G. Heubl. 2016. Molecular phylogeny of the mainly Mediterranean genera Chaenorhinum, Kickxia and Nanorrhinum (Plantaginaceae, tribe Antirrhineae), with focus on taxa in the Flora Iranica region. Nordic J. Bot. 34: 455-463.
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