Chaisson, E. (1993). Astronomy today. Prentice Hall.
Cita Chicago (17th ed.)Chaisson, Eric. Astronomy Today. New Jersey: Prentice Hall, 1993.
Cita MLA (9th ed.)Chaisson, Eric. Astronomy Today. Prentice Hall, 1993.
Atenció: Aquestes cites poden no estar 100% correctes.