(2007). 21st century astronomy. New York: W.W. Norton.
Trích dẫn kiểu Chicago21st Century Astronomy. New York: W.W. Norton, 2007.
MLA引文21st Century Astronomy. New York: W.W. Norton, 2007.
警告：这些引文格式不一定是100％准确.
APA引文
(2007). 21st century astronomy. New York: W.W. Norton.
Trích dẫn kiểu Chicago21st Century Astronomy. New York: W.W. Norton, 2007.
MLA引文21st Century Astronomy. New York: W.W. Norton, 2007.