Duffett-Smith, P., & Zwart, J. (2011). Practical astronomy with your calculator or spreadsheet. Cambridge University Press.
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Chicago-čujuhus (17. p.)
Duffett-Smith, Peter, juo Jonathan Zwart. Practical Astronomy with Your Calculator or Spreadsheet. Cambridge ; New York: Cambridge University Press, 2011.
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MLA-čujuhus (9. p.)
Duffett-Smith, Peter, juo Jonathan Zwart. Practical Astronomy with Your Calculator or Spreadsheet. Cambridge University Press, 2011.
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