Hoyle, F. (1975). Astronomy and cosmology: A modern course. San Francisco : W H Freeman.
Cita Chicago (17th ed.)Hoyle, Fred. Astronomy and Cosmology: A Modern Course. San Francisco : W H Freeman, 1975.
Cita MLA (9th ed.)Hoyle, Fred. Astronomy and Cosmology: A Modern Course. San Francisco : W H Freeman, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.