1. The rooting of cuttings of vegetative and flowering plants;Gorter,1957
2. Plant Propagation, Principles and Practices;Hartman,1983
3. Introduction to Floriculture;Larson,1980
4. Analysis of juvenile-like conditions affecting flowering in the black currant (Ribes nigrum);Schwabe;J. Exp. Bot.,1973
5. South Africa Proteaceae, know them and grow them;Vogts,1982