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The Families and Genera of Vascular Plants, Kubitzki K., Pteridophytes an Gymnosperms, KU Kramer, PS Green (Eds.), Springer-Verlag, Berlin-Heidelberg-New York-London-Paris-Tokyo-Hong Kong-Barcelona (1990), p. 404
Maier, Gerhard (2003). African Dinosaurs Unearthed. The Tendaguru Expeditions. 380 pp., 50 figs.: Bloomington and Indianapolis (Indiana University Press). $49.90