- Sandra Sider.（2007）.Handbook to Life in Renaissance Europe.Oxford University Press,USA.ISBN:9780195330847.
- 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.