APA (7th ed.) Citation

Keller, H. R. (1934). The dictionary of dates. The Macmillan Co.

Chicago Style (17th ed.) Citation

Keller, Helen Rex. The Dictionary of Dates. New York: The Macmillan Co, 1934.

MLA (9th ed.) Citation

Keller, Helen Rex. The Dictionary of Dates. The Macmillan Co, 1934.