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Blackburn, Bonnie, and Leofranc
Holfrod-Strevens. The Oxford Companion to the Year. 1999.
Oxford University Press. 937 p.
Bond, John J. Handy-book of Rules and Tables for Verifying Dates with the Christian Era - Giving an Account of the Chief Eras, and Systems used by various Nations. 1966. Russell & Russell, New York. 465 p.
Johnson, David E. From Day to Day - A Calendar of Notable Birthdays and Events. 2nd ed. 2001. The Scarecrow Press. 443 p.