Roy, A. E., & Clarke, D. (1977). Astronomy: Principles and practice. Adam Hilger.
Chicago Edition CitationRoy, A E., i D. Clarke. Astronomy: Principles and Practice. Bristol: Adam Hilger, 1977.
Cita MLARoy, A E., i D. Clarke. Astronomy: Principles and Practice. Adam Hilger, 1977.
Atenció: Aquestes cites poden no estar 100% correctes.