Fix, J. D. (1999). Astronomy: Journey to the cosmic frontier. WCB/McGraw-Hill.
Chicago Style CitationFix, John D. Astronomy: Journey to the Cosmic Frontier. WCB/McGraw-Hill, 1999.
Cita MLAFix, John D. Astronomy: Journey to the Cosmic Frontier. WCB/McGraw-Hill, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.