1. Ahuja, M. R. (1993) Micropropagation à la carte. In: Ahuja, M. R. Micropropagation of woody plants, Kluwer Academic Publishers, Dordrecht, pp. 1–8.
2. Alemanno, L.; Bertholy, M.; Michaux-Ferrière, N. (1997) A comparison between Theobroma cacao L. zygotic embryogenesis and somatic embryogenesis from floral explants. In Vitro Cell Dev. Biol., Rockville, 33, 163172.
3. Alemanno, L.; Bertholy, M.; Michaux-Ferrière, N.’(1996) Histology of somatic embryogenesis from floral tissues cocoa. Plant Cell Tissue Organ Cult., Dordrecht, 46, 187–194.
4. Astarita, L. V.; Guerra, M. P. (1998) Early somatic embryogenesis in Araucaria angustifolia-Induction and maintenance of embryonal-suspensor mass cultures. Rev. Bras. Fisiol. Veg., Brasilia, 10, n. 2, I13–118.
5. Attree, S. M.; Fowke, L. C. (1993) Embryogeny of gymnosperms advances in synthetic seed technology of conifers. Plant Cell Tissue Organ Cult., Dordrecht, 35, 1–35.