1. Guidelines for Germplasm Conservation by Botanic Gardens.;Bramwell,1991
2. Science and Colonial Development: the Role of the British Royal Botanic Gardens.;Brockway,1979
3. Catalogue of Succulents in Dutch Botanic Gardens.;Groen,1990
4. Botanic gardens and taxonomy — their economic role;Heywood;Bull. Bot. Survey India,1983
5. The historical significance of botanic gardens in S.E. Asia;Holttum;Taxon,1970