For Zannichellia
Haynes, R.R., and C.B. Hellquist. 2000d. Zannichelliaceae. In Flora of North America Editorial Committee. 2000. Flora of North America north of Mexico. Volume 22, Magnoliophyta: Alismatidae, Arecidae, Commelinidae (in part), and Zingiberidae. Oxford Univ. Press, New York, NY. 352 pp.
Haynes, R.R., and L.B. Holm-Nielsen. 1987. The Zannichelliaceae in the Southeastern United States. J. Arnold Arb. 68: 259-268.
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