Aspden, H. (1975). Gravitation. Sabberton Publications.
芝加哥风格引文Aspden, Harold. Gravitation. Southampton, Eng.: Sabberton Publications, 1975.
MLA引文Aspden, Harold. Gravitation. Sabberton Publications, 1975.
警告：这些引文格式不一定是100％准确.
APA引文