..., A. (2002). 21 st Century Astronomy. W.W.Norton & Company,Inc.
Chicago Style Citation..., Astronomy. 21 St Century Astronomy. W.W.Norton & Company,Inc, 2002.
MLA Citation..., Astronomy. 21 St Century Astronomy. W.W.Norton & Company,Inc, 2002.
Warning: These citations may not always be 100% accurate.