1. Arditti J & Ernst R (1993) Micropagation of Orchids. John Wiley and Sons, York
2. Ernst R (1975) Studies in asymbiotic culture of orchids. Amer. Orchid. Soc. Bull. 43: 35?38
3. Ernst R (1976) Charcoal or glasswool in asymbiotic culture of orchids. In: Senghas K (Ed) Proc. 8th World Orchid Conf. (pp 379?383). Deutsche Orchideen Gesellschaft, Frankfurt
4. Ernst R (1986) Seed and clonal propagation of Phalaenopsis. In: Rao AN(Ed) PROC, 5th ASEAN Orchid Congr. (pp 31?41). Parks and Recreation Dept., Ministry of National Development, Singapore
5. Morel G (1974) Clonal multiplication of orchids. In: Withner CL (Ed) The Orchids: Scientific Studies (pp 169?222). John Wiley & Sons, Inc.