Citazione APA

Roy, A. E., & Clarke, D. C. (1982). Astronomy: Principles and practice (2nd ed.). Adam Hilger ltd.

Stile di citazione Chicago

Roy, A. E., e D. C. Clarke. Astronomy: Principles and Practice. 2nd ed. Bristol: Adam Hilger ltd, 1982.

Citazione MLA

Roy, A. E., e D. C. Clarke. Astronomy: Principles and Practice. 2nd ed. Adam Hilger ltd, 1982.