Cita APA

Kaufmann, W. J. 1. (1979). Galaxies and Quasars. San Francisco: W. H. Freeman and Company.

Citación estilo Chicago

Kaufmann, William John 1942-. Galaxies and Quasars. San Francisco: W. H. Freeman and Company, 1979.

Cita MLA

Kaufmann, William John 1942-. Galaxies and Quasars. San Francisco: W. H. Freeman and Company, 1979.