Crane, P.R. (1988). "The phylogenetic position and fossil history of the Magnoliaceae". ใน Hunt, David R. (บ.ก.). Magnolias and their allies: Proceedings of an International Symposium, Royal Holloway, University of London, Egham, Surrey, U.K., 12-13 April 1996. Milbourne Port. p. 21. ISBN9780951723487. OCLC40781614.