1. Arber, E. A. N., Parkin, J. 1907. On the origin of angiosperms. J. Linn. Soc. Bot. 38: 29–80.
2. Bachmann, K. 1988. Evolutionary genetics and the genetic control of morphogenesis in flowering plants. In: Hecht, M. K., Wallace, B., Prance, G.T., (eds.) Evolutionary Biology 16: 157–208.
3. Barabé, D., Bergeron, Y., Vincent, G. 1987. La répartition des charactères dans la classification des Hamamelididae (Angiospermae). Can. J. Bot. 65: 1756–1767.
4. Bate-Smith, E.-C. 1962. See general references.
5. Batten, D.J. 1989. Systematic relationships between Normapolles pollen and the Hamamelidae. In: Crane, P. R., Blackmore, S. (eds.) Evolution, systematics, and fossil history of the Hamamelidae, Vol.2. Oxford: Clarendon Press, pp. 9–21.