Sagan, C. (1970). Planetary exploration. Oregon State System of Higher Education.
芝加哥风格引文Sagan, Carl. Planetary Exploration. Eugene, Oregon: Oregon State System of Higher Education, 1970.
MLA引文Sagan, Carl. Planetary Exploration. Oregon State System of Higher Education, 1970.
警告：这些引文格式不一定是100％准确.