Cita APA

Arny, T. T., & Thomas T. Arny. (2008). Explorations: An introduction to astronomy. New York, NY: McGraw-Hill.

Citación estilo Chicago

Arny, Thomas T., y Thomas T. Arny. Explorations: An Introduction to Astronomy. New York, NY: McGraw-Hill, 2008.

Cita MLA

Arny, Thomas T., y Thomas T. Arny. Explorations: An Introduction to Astronomy. New York, NY: McGraw-Hill, 2008.