Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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