APA ציטוט

Freedman, R. A., Geller, R. M., & Kaufmann, W. J. (2011). Universe (Ninth edition.). W. H Freeman and Company.

Chicago Style (17th ed.) Citation

Freedman, Roger A., Robert M. Geller, and William J. Kaufmann. Universe. Ninth edition. New York, USA: W. H Freeman and Company, 2011.

ציטוט MLA

Freedman, Roger A., et al. Universe. Ninth edition. W. H Freeman and Company, 2011.