1. Redenbaugh, K.; Fujii, J.A. and Slade, D. (1988) Encapsulated plant embryos. In: Mizrahi, A. (Ed.) Advances in biotechnological processes. Vol. 9. Liss, New York, USA; pp. 225–248.
2. Redenbaugh, K; Passch, BD; Nichol, JW; Kossler, ME; Viss, PR and Walker, KA (1986) Somatic seeds: encapsulation of asexual plant embryos. Bio/Technol. 4: 797–801.
3. Esau, K. (1977) Anatomy of Seed Plants. John Wiley & Sons, New York, USA.
4. Kamada, H (1985) Artificial seed. In: Tanaka, R. (Ed.) Practical technology on the mass production of clonal plants. CMC Publisher, Tokyo, Japan (in Japanese, cited in Redenbaugh et al., 1988).
5. Williams, E.G. and Maheswaran, G. (1986) Somatic embryogenesis: factors influencing coordinated behaviour of cells as an embryogenic group. Ann. Bot. 57: 443–462.