Cita APA (7a ed.)

Ryden, B. S. (2014). Introduction to cosmology (Pearson new international edition.). Pearson.

Cita Chicago Style (17a ed.)

Ryden, Barbara Sue. Introduction to Cosmology. Pearson new international edition. Harlow: Pearson, 2014.

Cita MLA (8a ed.)

Ryden, Barbara Sue. Introduction to Cosmology. Pearson new international edition. Pearson, 2014.