Cita APA (7th ed.)

Freedman, R. A., Geller, R. M., & Kaufmann, W. J. (2014). Universe (10a. ed.). W. H. Freeman and Company.

Cita Chicago (17th ed.)

Freedman, Roger A., Robert M. Geller, i William J. Kaufmann. Universe. 10a. ed. Nueva York: W. H. Freeman and Company, 2014.

Cita MLA (9th ed.)

Freedman, Roger A., et al. Universe. 10a. ed. W. H. Freeman and Company, 2014.