Cita APA (7a ed.)

Duffett-Smith, P., & Zwart, J. (2011). Practical Astronomy with your Calculator or Spreadsheet (4th ed.). Cambridge University Press.

Cita Chicago Style (17a ed.)

Duffett-Smith, Peter, y Jonathan Zwart. Practical Astronomy with Your Calculator or Spreadsheet. 4th ed. Leiden: Cambridge University Press, 2011.

Cita MLA (8a ed.)

Duffett-Smith, Peter, y Jonathan Zwart. Practical Astronomy with Your Calculator or Spreadsheet. 4th ed. Cambridge University Press, 2011.