Joshua Dorsey Warfield, The Founders of Anne Arundel And Howard Counties, Maryland, Baltimore, Maryland, Kohn & Pollock, , 208 p. (ISBN0-8063-7971-5, lire en ligne)
Discussion at Wargs.com of Benedict Swingate Calvert's ancestry G. S. H. Lee Washington also published Two scions of the Royal Stuarts in Colonial America, in Notes and Queries, vol. 198, no. 2 (December 1953), p. 527–529, in which he withdrew the claim of descent from the Countess of Walsingham(en) and identified a different mother for Benedict Swingate Calvert. In a later article, Family knowledge in genealogy, in Notes and Queries, vol. 210, no. 2 (February 1965), pp. 43–47, Washington withdrew both previous claims and identified a different mother entirely. Retrieved September 2010
Callcott, p. 270 suggests that this connection is not reliable, stating that "the connection between Benedict Calvert and the Countess of Walsingham(en) in this article rests on 'family letters' whose location is not given."
Discussion at Wargs.com of Benedict Swingate Calvert's ancestry G. S. H. Lee Washington also published Two scions of the Royal Stuarts in Colonial America, in Notes and Queries, vol. 198, no. 2 (December 1953), p. 527–529, in which he withdrew the claim of descent from the Countess of Walsingham(en) and identified a different mother for Benedict Swingate Calvert. In a later article, Family knowledge in genealogy, in Notes and Queries, vol. 210, no. 2 (February 1965), pp. 43–47, Washington withdrew both previous claims and identified a different mother entirely. Retrieved September 2010
