Berendsohn, W. G. (1994): IOPI World Vascular Plant Checklist. A CASE Model of Checklist System Data. In: Wilson, K. (ed.): Global Plant Checklist project plan, version 1.2. International Organization for Plant Information (IOPI), Sidney. (An updated model, version 7.3 is available via the Internet - World Wide Web under the URL http://userpage.fu-berlin.de/~wgb/).
Berendsohn, W. G. & Raisin, D. (unpubl.): Plantas III - partial prototype implementation of the IOPI taxonomic data Model. BioSys GmbH, Berlin.
Brummitt, R. K. & Powell (1992): Authors of Plant Names. Royal Botanic Gardens, Kew.
Codd, E. F. (1979): Extending the Database Relational Model to Capture More Meaning. ACM Transactions on Database Systems 4(4): 397-434
Getz, K., Litwin, P. & Reddick, G. (1994): Microsoft Access 2 Developer's Handbook. Sybex, Alameda.
Halliday, P., Meikle, R. D., Story, J. & Wilkinson, H. (1980): Draft Index of Author Abbreviations Compiled at the Herbarium, Royal Botanic Gardens, Kew. 2nd. impression 1984. HMSO, United Kingdom.