Cita APA (7a ed.)

Smith, M. H., & Prescott, C. S. (1979). Our earth (Teacher's edition.). The Fideler Company.

Cita Chicago Style (17a ed.)

Smith, Marion Hagens, y Carol S. Prescott. Our Earth. Teacher's edition. Grand Rapids, Michigan Toronto, Canada: The Fideler Company, 1979.

Cita MLA (9a ed.)

Smith, Marion Hagens, y Carol S. Prescott. Our Earth. Teacher's edition. The Fideler Company, 1979.