Sagan, C. (2011). Pale blue dot: A vision of the human future in space.
Chicago Style (17th ed.) CitationSagan, Carl. Pale Blue Dot: A Vision of the Human Future in Space. 2011.
MLA引文Sagan, Carl. Pale Blue Dot: A Vision of the Human Future in Space. 2011.
警告：這些引文格式不一定是100％准確.