• Google Scholar
  https://scholar.google.com.hk/
• Kew record of Taxonomic literature
  https://kbd.kew.org/kbd/searchpage.do
• Taxonomic literature: a selective guide to botanical publications
  https://www.biodiversitylibrary.org/item/103414#page/11/mode/1up
• Hunt Institute for Botanical Documentation
  https://huntbotanical.org/archives/?1
• The Contributions from the U.S. National Herbarium, Smithsonian Institution
  https://botany.si.edu/pubs/cusnh/index.htm
• Botanicus – historic literature
  https://www.botanicus.org/browse
• Biodiversity Heritage Library (BHL)
  https://www.biodiversitylibrary.org
• Taxonomic Literature (1753-1940)
  https://www.sil.si.edu/digitalcollections/tl-2/
• Biblioteca Digital
  https://bibdigital.rjb.csic.es/ing/index.php
• JSTOR (archive of journals)
  https://www.jstor.org
• WorldCat
  https://www.worldcat.org
• Worldwide Science Sources
  https://worldwidescience.org/index.html

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