Szucs, Loretto Dennis; Luebking, Sandra Hargreaves (2006). The Source. Ancestry Publishing. p. 361. ISBN9781593312770. Consultado el 17 de marzo de 2015. «English US census 1790.»
James, Wither (March 2006), «An Endangered Partnership: The Anglo-American Defence Relationship in the Early Twenty-first Century», European Security15 (1): 47-65, ISSN0966-2839, doi:10.1080/09662830600776694.
James, Wither (March 2006), «An Endangered Partnership: The Anglo-American Defence Relationship in the Early Twenty-first Century», European Security15 (1): 47-65, ISSN0966-2839, doi:10.1080/09662830600776694.