Cita APA

Chaisson,Eric, & Steve Mcmillan. (2011). Astronomy today (7th.). Addison-wesley.

Chicago Edition Citation

Chaisson,Eric, i Steve Mcmillan. Astronomy Today. 7th. Boston: Addison-wesley, 2011.

Cita MLA

Chaisson,Eric, i Steve Mcmillan. Astronomy Today. 7th. Addison-wesley, 2011.

Atenció: Aquestes cites poden no estar 100% correctes.