APA (7th ed.) Citation

Watkins, H. (1954). Time counts: The story of the calendar. Philosophical Library.

Chicago Style (17th ed.) Citation

Watkins, Harold. Time Counts: The Story of the Calendar. New York: Philosophical Library, 1954.

MLA (9th ed.) Citation

Watkins, Harold. Time Counts: The Story of the Calendar. Philosophical Library, 1954.