Sources:
Ash, Sidney. 1986. The Early Mesozoic Land Flora of the Northern Hemisphere. Pp. 143-161 in R. A. Gastaldo (ed). Land Plants: Notes for a Short Course. Univ. of Tennessee Dept. of Geol. Sci., Studies in Geology 15.
Padian, K. (ed) 1985. The Beginning of the Age of Dinosaurs. Cambridge Univ. Press, Cambridge.
