Conn, B.J. (1996) (ed.): HISPID3. Herbarium Information Standards and Protocols for
  Interchange of Data.Version 3. Royal Botanic Gardens Sydney. [TDWG standard] [Electronic
  version:] http://www.rbgsyd.gov.au/hiscom/hispid_top.html.
  
  Field-level database exchange standards for botanical gardens:
  IUCN/WWF (1987): The International Transfer Format (ITF) for Botanic Garden Plant
  Records. Plant Taxonomic Database Standards No. 1. Hunt Institute for Botanical
  Documentation, Pittsburgh. [See Wyse Jackson (1997) for latest version.] [TDWG Standard]
  Wyse Jackson, D. (compiler) (1997): International Transfer Format for Botanic Garden
  Plant Records (version 2.00 draft 3.2.). Botanic Gardens Conservation International,
  Richmond. [proposed TDWG standard] [Electronic version:] http://www.rbgkew.org.uk/BGCI/news.htm 
  Field-level standard for botanical names:
  Bisby, F. (1995): Plant names in botanical databases. Plant
  Taxonomic Database Standards No. 3, Hunt Institute for Botanical Documentation,
  Pittsburgh. [TDWG Standard]. 
  Taxonomic descriptions:
  Dallwitz, M.J. & Paine, T. A. (1986): Users guide to the DELTA system. CSIRO
  Division of Entomology Report No. 13, pp. 3-6. [TDWG Standard] [Updates and
  further information under http://biodiversity.uno.edu/delta/]
  2. Standard data:
  Authors of plant names:
  Brummit, R.K. & C.E. Powell 1992. Authors of plant names. Royal Botanic Gardens
  Kew. [TDWG Standard] [Searchable database: http://www.rbgkew.org.uk/web.dbs/webdbsintro.html.
  Dataset can be purchased from RBG Kew and is included in the Index Kewensis CD-ROM.]
  Bibliography:
  Bridson, G.D.R. & Smith, E. R. (1991): Botanico-Periodicum-Huntianum/supplementum.
  Hunt Institute for Botanical Documentation, Pittsburgh. 1068 pages. [TDWG standard as to
  abbreviations for titles of periodicals. To be used in conjunction with Lawrence (1968).]
  Lawrence et al. 1968. Botanico-periodicum-huntianum. Hunt Institute for Botanical
  Documentation, Pittsburgh. [TDWG Standard] 
  Stafleu, F. A. & Cowan, R. S. (1976-): Taxonomic literature, ed. 2 and its
  Supplements. Reg. Veg. 125 etc. [Key fields for
  this standard are currently being automated as a cooperative project between the Royal
  Botanic Garden-Edinburgh, the USDA, NRCS, National Plant Data Center and IAPT.] [TDWG
  Standard] 
  Geography, Ecology, and Conservation: 
  FGDC (1997): Appendix I: National Vegetation Classification System: The Upper Levels
  (Table). FGDC Vegetation Classification and Information Standards. Federal Geographic Data
  Committee, Vegetation Subcommittee. Federal Geographic Data Committee Secretariat, Reston.
  [150K Table under http://www.nbs.gov/fgdc.veg/standards/appendix1.htm.
  Part of the standard vegetation classification system for use by U.S. Federal Agencies and
  their cooperators.]
  Hollis, S. & Brummitt, R. (1992): World Geographical Scheme for Recording Plant
  Distributions. Plant Taxonomic Database Standards No. 2, International Working Group on
  Taxonomic Databases for Plant Sciences (TDWG). Hunt Institute for Botanical Documentation,
  Pittsburgh. [TDWG Standard] [Electronic version available under http://www.bgbm.org/TDWG/geo/default.htm]
  ISO (1988): Codes for the representation of names of countries. Third edition; ISO
  3166: 1988 Aug 15; 53 p. [A list of all the countries represented in this version of
  ISO-3166 along with their 2-letter, 3-letter, and numeric codes, prepared for the MUSE
  project: gopher://muse.bio.cornell.edu:70/00/standards/iso/iso-3166.]
  ISO (1994): Codes from ISO 3166. Updated by the RIPE Network Coordination Centre, in
  coordination with the ISO 3166 Maintenance Agency at DIN Berlin. http://www.chemie.fu-berlin.de/outerspace/mirror-packages/german/iso-3166.html
  IUCN (1994): IUCN Red List Categories. Prepared by the IUCN Species
  Survival Commission. As approved by the 40th meeting of the IUCN Council, Gland,
  Switzerland, 30 November 1994.
  Leon, C., Mackinder, D., Rooney, P. & Synge, H. (1995): Plant occurrence and status
  scheme (POSS). World Conservation Monitoring Centre, Cambridge, UK. Unpublished. [TDWG
  Standard]
  Takhtajan, A. (1986): Floristic Regions of the World. Floristic regions of the world.
  University of California Press. Bishen Singh, Dehra Dun. [Pp. vii-xiii accepted as
  standard phytogeographical regions by TDWG.] 
  Economic botany:
  Cook, E. M. (1995): Economic Botany Data Collection Standard. Prepared for the
  International Working Group on Taxonomic Databases for Plant Sciences (TDWG). Royal
  Botanic Gardens, Kew. [TDWG Standard]
  Institutional abbreviations:
  Heywood, C. A., Heywood, V. H. & Wyse Jackson, P. S. (1990): International
  Directory of Botanical Gardens. Koeltz, Koenigstein.
  Holmgren, P. K., Holmgren, N. H. & Barnett, L. C. (1990): Index Herbariorum, Pt. 1:
  The Herbaria of the World (ed. 8). Regnum Vegetabile 120. [TDWG Standard] [An updated
  version - not yet accepted as TDWG standard, is being made available under http://www.nybg.org/bsci/ih/ih.html]