1. Abu Hamad, A.B.M., 2004. Palaeobotany and palynostratigraphy of the Permo-Triassic in Jordan. PhD Thesis, University Hamburg, 330 pp. http://www.sub.uni-hamburg.de/opus/volltexte/2005/2309/pdf/dissertation.pdf.
2. Anderson, J.M., Anderson, H.M., 1983. Palaeoflora of southern Africa — Molteno Formation. Vol. 1, Part 1. Introduction/Part 2. Dicroidium. A.A. Balkema, Rotterdam, 227 pp.
3. Palaeoflora of South Africa;Anderson,1985
4. Patterns of Gondwana plant colonisation and diversification;Anderson;J. Afr. Earth Sci.,1999
5. Die Gattungen Thinnfeldia Ett. und Dicroïdium Goth. Kungl;Antevs;Svenska Vetensk.-Akad. Handl.,1914