- rembrandttoreynolds.blogspot.com 2015/02/english-…
- Gallerix.org storeroom/1276166887/N/804/
- archive.org stream/…The history of the pilgrim expedition shows that Robert Cushman was the leading and most energetic spirit of the enterprise, both in Leyden and England.
- library.princeton.edu libraries/firestone/rbsc/…
- encyclopedia2.thefreedictionary.com Jan van Leyden
- medium.com lessons-from-history/when-the-dutch-…
- useum.org artwork/The-Engagement-Lucas-van-Leyden
- http://artcyclopedia.com artists/leyden_lucas_van.html
- timewisetraveller.co.uk 2ndAnglo.html