APA Edition Citation

Roy A E; Clarke D. (2011). Astronomy: Principles and practice (Fourth edition.). IoP.

Chicago Edition Citation

Roy A E; Clarke D. Astronomy: Principles and Practice. Fourth edition. N D: IoP, 2011.

MLA Edition Citation

Roy A E; Clarke D. Astronomy: Principles and Practice. Fourth edition. IoP, 2011.

Warning: These citations may not always be 100% accurate.