1. Alefeld, F.G.C. 1862. Über die Malven. Österr. Bot. Z. 22: 247–261.
2. Alverson, W.S. 1986. Quararibea Aubl. s.l. (Bombacaceae) in Mexico, Central America and the Antilles: a taxonomic study. Ph.D. Thesis. Madison: University of Wisconsin, 488 pp.
3. Alverson, W.S. 1994. New species and combinations of Catostemma and Pachira (Bombacaceae). Novon 4: 3–6.
4. Alverson, W.S., Steyermark, J.A. 1997. Bombacaceae. In: Steyermark, J.A., Berry, P.E., Holst, B.K. (eds.) Flora of the Venezuelan Guayana, 3, Araliaceae–Cactaceae. St. Louis: Missouri Botanical Garden, pp. 496–527.
5. Alverson, W.S. et al. 1998. See general references.