APA (7th ed.) Citation

Duffett-Smith, P. (1979). Practical astronomy with your calculator. Univ. Pr.

Chicago Style (17th ed.) Citation

Duffett-Smith, Peter. Practical Astronomy with Your Calculator. Cambridge u.a: Univ. Pr, 1979.

MLA (9th ed.) Citation

Duffett-Smith, Peter. Practical Astronomy with Your Calculator. Univ. Pr, 1979.