Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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