Cita APA (7a ed.)

Smith, W., & Bührer, E. M. (1975). Flags through the ages and across the world. McGraw-Hill.

Cita Chicago Style (17a ed.)

Smith, Whitney, y Emil M. Bührer. Flags Through the Ages and Across the World. New York [etc.]: McGraw-Hill, 1975.

Cita MLA (9a ed.)

Smith, Whitney, y Emil M. Bührer. Flags Through the Ages and Across the World. McGraw-Hill, 1975.