Cita APA (7th ed.)
Duffett-Smith, P., & Zwart, J. (2011). Practical astronomy with your calculator or spreadsheet. Cambridge University Press.
Cita Chicago (17th ed.)
Duffett-Smith, Peter, i Jonathan Zwart. Practical Astronomy with Your Calculator or Spreadsheet. Cambridge ; New York: Cambridge University Press, 2011.
Cita MLA (9th ed.)
Duffett-Smith, Peter, i Jonathan Zwart. Practical Astronomy with Your Calculator or Spreadsheet. Cambridge University Press, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.