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A genealogical profile of John Howland, (a collaboration of Plimoth Plantation and New England Historic Genealogical Society accessed 2013) Archivováno 1. 11. 2012 na Wayback Machine./
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Pilgrim Hall Museum. www.pilgrimhallmuseum.org [online]. [cit. 2020-04-21]. Dostupné v archivu pořízeném z originálu dne 2018-02-26.
A genealogical profile of John Howland, (a collaboration of Plimoth Plantation and New England Historic Genealogical Society accessed 2013) Archivováno 1. 11. 2012 na Wayback Machine./
Robert Anderson, Pilgrim Village Families Sketch: John Howland (a collaboration between American Ancestors and New England Historic Genealogical Society)Archivováno 4. 9. 2013 na Wayback Machine./
ROBERTS, Gary Boyd. #55 Royal Descents, Notable Kin, and Printed Sources: Notable Descendants of Henry and Margaret (----) Howland of Fenstanton, Huntingdonshire, Parents of John Howland of the Mayflower [online]. New England Historic Genealogical Society [cit. 2010-10-03]. Dostupné v archivu pořízeném z originálu dne June 30, 2009. (anglicky)
