Douglas, G. W. 1., & Douglas, G. W. 1. (1963). The American book of days: A compedium of information about holidays, festivals, notable anniversaries and Christian and Jewish holy days with notes on other American anniversaries worthy of remembrance. New York, New York: H. W. Wilson.

Douglas, George William 1850-1926, and George William 1850-1926 Douglas. The American Book of Days: A Compedium of Information About Holidays, Festivals, Notable Anniversaries and Christian and Jewish Holy Days With Notes On Other American Anniversaries Worthy of Remembrance. New York, New York: H. W. Wilson, 1963.

Douglas, George William 1850-1926, and George William 1850-1926 Douglas. The American Book of Days: A Compedium of Information About Holidays, Festivals, Notable Anniversaries and Christian and Jewish Holy Days With Notes On Other American Anniversaries Worthy of Remembrance. New York, New York: H. W. Wilson, 1963.