APA (7th ed.) Citation

Ryden, B. S. (2002). Introduction to cosmology. Benjamin-Cummings.

Chicago Style (17th ed.) Citation

Ryden, Barbara Sue. Introduction to Cosmology. Menlo Park, Calif. [u.a.]: Benjamin-Cummings, 2002.

MLA (9th ed.) Citation

Ryden, Barbara Sue. Introduction to Cosmology. Benjamin-Cummings, 2002.