Cita APA (7a ed.)

Roy, A. E., & Clarke, D. (1987). Astronomy: Principles and practice (3rd ed.). A. Hilger.

Cita Chicago Style (17a ed.)

Roy, A. E., y D. Clarke. Astronomy: Principles and Practice. 3rd ed. Bristol: A. Hilger, 1987.

Cita MLA (9a ed.)

Roy, A. E., y D. Clarke. Astronomy: Principles and Practice. 3rd ed. A. Hilger, 1987.