Öpik, E. J. (May 1962), "The Lunar Atmosphere", Planetary and Space Science, 9 (5), Elsevier: pp. 211–244, डीओआई:10.1016/0032-0633(62)90149-6, आईएसएसएन0032-0633{{citation}}: |pages= has extra text (help); More than one of |periodical= and |journal= specified (help).
unh.edu
www-ssg.sr.unh.edu
University of New Hampshire Experimental Space Plasma Group. "What is the Interstellar Medium". The Interstellar Medium, an online tutorial. मूल से से 17 फ़रवरी 2006 को पुरालेखित।. अभिगमन तिथि: 2006-03-15.
web.archive.org
University of New Hampshire Experimental Space Plasma Group. "What is the Interstellar Medium". The Interstellar Medium, an online tutorial. मूल से से 17 फ़रवरी 2006 को पुरालेखित।. अभिगमन तिथि: 2006-03-15.
worldcat.org
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Öpik, E. J. (May 1962), "The Lunar Atmosphere", Planetary and Space Science, 9 (5), Elsevier: pp. 211–244, डीओआई:10.1016/0032-0633(62)90149-6, आईएसएसएन0032-0633{{citation}}: |pages= has extra text (help); More than one of |periodical= and |journal= specified (help).
