Douglas, G. W. (1937). The American book of days: A compendium of information about holidays, festivals, notable anniversaries and Christian and Jewish holy days, with notes on other American anniversaries worthy of remembrance. New York: H.W. Wilson Co..

Douglas, George William. The American Book of Days: A Compendium of Information About Holidays, Festivals, Notable Anniversaries and Christian and Jewish Holy Days, With Notes On Other American Anniversaries Worthy of Remembrance. New York: H.W. Wilson Co., 1937.

Douglas, George William. The American Book of Days: A Compendium of Information About Holidays, Festivals, Notable Anniversaries and Christian and Jewish Holy Days, With Notes On Other American Anniversaries Worthy of Remembrance. New York: H.W. Wilson Co., 1937.