APA (7th ed.) Citation

Brindze, R., & Carter, H. (1949). The story of our calendar. Vanguard.

Chicago Style (17th ed.) Citation

Brindze, Ruth, and Helene Carter. The Story of Our Calendar. New York: Vanguard, 1949.

MLA (9th ed.) Citation

Brindze, Ruth, and Helene Carter. The Story of Our Calendar. Vanguard, 1949.