- ^ Sandra Sider.（2007）.Handbook to Life in Renaissance Europe.Oxford University Press,USA.ISBN:9780195330847.
- ^ An introduction to Gerarde's Herball: A Generall Historie of Plants: Virginia.Edu. Similarly in entry "Botany" in The Penny Cyclopedia. See also Dodonaeus in Japan (year 2001) pp. 37-38. The situation is reported a little differently in "A short history of the Herbal of John Gerard", where Gerard's knowledge is said to have lacked lacked depth and he essentially compiled from others, but not exclusively from the Dodoens source. See also Rembert Dodoens and Carolus Clusius.
- Herball, or Generall Historie of Plantes, year 1597 edition, by John Gerarde – downloadable book at Archive.org; the same copy is also viewable and downloadable at Botanicus.org.
- Herball, or Generall Historie of Plantes, year 1636 edition, by John Gerarde, enlarged by Thomas Johnson. Downloadable book.
- Online Galleries, History of Science Collections, University of Oklahoma Libraries - This site has high resolution images of works by and about John Gerard (in .jpg and .tiff format) and includes a copy of Gerard's 1597 Herbal in which the drawings have been colored by hand.
- AntiqueCannabisBook.com – has the description of Hemp in Gerarde's Herbal.