For Clethraceae
Anderberg, A.A., and X. Zhang. 2002. Phylogenetic relationships of Cyrillaceae and Clethraceae (Ericales) with special emphasis on the genus Purdiaea Planch. Org. Divers. Evol. 2: 127-137.
Schneider & Bayer. 2004. In Kubitzki, K., ed. 2004. The families and genera of vascular plants. VI. Flowering plants – Dicotyledons – Celastrales, Oxalidales, Rosales, Cornales, Ericales. Springer, Berlin. 489 pp.
Sleumer, H. 1967b. Monographia Clethracearum. Botanische Jahrbücher Syst. 87: 36-175.
Tucker, G.C., and S.C. Jones. 2009. Clethraceae. In Flora of North America Editorial Committee. 2009. Flora of North America north of Mexico. Volume 8, Magnoliophyta: Paeoniaceae to Ericaceae. Oxford Univ. Press, New York, NY. 585 pp.
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