James Emanuel Ernst, Roger Williams, New England Firebrand (Macmillan Co., Rhode Island, 1932), pg. 246 [1]Archived 4 January 2014 at the Wayback Machine
McKinney, Michael (March 2012). "Reading Outside the Lines"(PDF). The Providence Journal. Archived(PDF) from the original on July 10, 2012. Retrieved September 16, 2012.
Bryant, Sparkle (October 19, 2015). "The Tree Root That Ate Roger Williams". NPS News Releases. National Park Service. Archived from the original on April 8, 2018. Retrieved January 27, 2018.
"Everson and the Wall of Separation". Pew Research Center's Religion & Public Life Project. Pew Research Center. May 14, 2009. Archived from the original on December 14, 2017. Retrieved December 13, 2017.
Bryant, Sparkle (October 19, 2015). "The Tree Root That Ate Roger Williams". NPS News Releases. National Park Service. Archived from the original on April 8, 2018. Retrieved January 27, 2018.
"Everson and the Wall of Separation". Pew Research Center's Religion & Public Life Project. Pew Research Center. May 14, 2009. Archived from the original on December 14, 2017. Retrieved December 13, 2017.
James Emanuel Ernst, Roger Williams, New England Firebrand (Macmillan Co., Rhode Island, 1932), pg. 246 [1]Archived 4 January 2014 at the Wayback Machine
McKinney, Michael (March 2012). "Reading Outside the Lines"(PDF). The Providence Journal. Archived(PDF) from the original on July 10, 2012. Retrieved September 16, 2012.