1. Ballou, J.D. (1990) Capacity. Software to Establish Target Population Sizes for Managed Species, National Zoological Park, Washington, DC.
2. Boer, L.E.M. de (1989a) Preservation of species in zoological and botanical gardens, in EEP Co-ordinators’ Manual (ed. L.E.M. de Boer), Stichting Nationaal Onderzoek Dierentuinen, Amsterdam, Section 2, pp. 1–27.
3. Boer, L.E.M. de (1989b) Genetics and breeding programs; genetic guidelines and their background for EEP-co-ordinators, in EEP Co-ordinators’ Manual (ed. L.E.M. de Boer), Stichting Nationaal Onderzoek Dierentuinen, Amsterdam,Section 4, 1–86.
4. Boer, L.E.M. de (1992) Ex situ propagation programmes as a contribution to the conservation of biodiversity, in Conservation of Biodiversity for Sustainable Development (eds O.T. Sandlund, K. Hindar and A.H.D. Brown), Scandinavian University Press, Oslo.
5. CBSG (1991) Genome Resource Banking for Wild Species Conservation, Captive Breeding Specialist Group, Apple Valley, MN.