1. Barbera, G., 1995. History, economic and agro-ecological importance. In: Barbera, G., Inglese, P., Pimienta-Barrios, E. (Eds.), Agro-ecology, Cultivation and Uses of Cactus Pear. FAO, Rome, pp. 1–8.
2. Berlyn, G.P., Miskche, J.P., 1976. Botanical Microtechnique and Cytochemistry. Iowa University Press, Ames, IA.
3. Micrografting: a tool for the plant propagator;Burger;Proc. Int. Plant Prop. Soc.,1985
4. Cullmann, W., Göetz, E., Gröener, G., 1986. The Encyclopedia of Cacti. Timber, Portland, OR.
5. Some outstanding rootstock for your cactus;Das;Indian Hort.,1976