Bisby F.A. 1994. Plant Names in Botanical Databases; Plant Taxonomic Database Standards No.3 published for the TDWG
http://www.tdwg.org/standards/113/download/113-528-1-RV.pdf;
Hyam R. 2006. TDWG Taxon Name LSID Ontology; TDWG Biodiversity Information Standards; vers.0.2 Modified: 2007-05-04
http://rs.tdwg.org/ontology/voc/TaxonName;
Hyam R. 2006. TDWG Taxon Rank LSID Ontology; TDWG Biodiversity Information Standards; vers. 0.2 Modified: 2007-11-19
http://rs.tdwg.org/ontology/voc/TaxonRank;
Hyam R. and Kennedy, J. 2005. Taxon Concept Schema – User Guide ,TDWG
http://www.tdwg.org/standards/;
Pereira R. 2007. Plant occurrence and status scheme. A Standard for Recording the Relationship between a Plant and a Place; World Conservation Monitoring Centre, An International Working Group on Taxonomic Databases Standard, TDWG
http://www.tdwg.org/standards/106/download/106-522-1-RV.pdf
