Dippel, L. (1889). Handbuch der Laubholzkunde. Darmstadt. Facsimile.
phylodiversity.net
Li, J., Del Tredici, P., Yang, S., & Donoghue, M. J. (2002). Phylogenetic relationships and biogeography of Stewartia (Camellioideae, Theaceae) inferred from nuclear ribosomal DNA ITS sequences. Rhodora 104: 117-133 (pdf file).
rbgkew.org.uk
Royal Botanic Gardens, Kew. Vascular Plant Families and Genera: Theaceae