Mark D. Herber, Ancestral Trails: The complete guide to British genealogy and family history, Sutton Publishing, 1997, ISBN 0-7509-1418-1 C. R. Chapman & P. M. Litton, Marriage laws, rites, records and customs, Lochin Publishing, 1996 National Conference of Commissioners on Uniform State Laws, American Uniform Marriage and Marriage License Act, Railway Printing Company, 1911 (Note, this is a "model act", not an actual law passed by Congress or individual states.) http://www.mexicolaw.com/Marriage%20in%20Mexico.htm