^Kopal, Zdeněk. Communications on the Moon. New Scientist. June 14, 1962, (291): 573.
^Levasseur-Regourd, Anny-Chantal; Hiroichi Hasegawa. Origin and Evolution of Interplanetary Dust. International Astronomical Union Colloquium. 1991: 159. ISBN 0-7923-1365-8.
^ 3.03.13.2Sheehan, William. The immortal fire within: the life and work of Edward Emerson Barnard. Cambridge University Press. 1995: 69–70. ISBN 0-521-44489-6.
外部連結
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