ધૂમકેતુ: આવૃત્તિઓ વચ્ચેનો તફાવત

# Aristotle (ca. 350 B.C.) ''Meteorologia''. An English translation by E.W. Webster is [http://classics.mit.edu/Aristotle/meteorology.1.i.html available online].

# Bill Arnett. (2000). "Astronomical Names." [http://www.nineplanets.org/names.html Available online].

# European Southern Observatory. (2003). "A Brief history of comets." Available online: [http://www.eso.org/outreach/info-events/hale-bopp/comet-history-1.html Part I], [http://www.eso.org/outreach/info-events/hale-bopp/comet-history-2.html Part II].

# {{Journal reference | Author=Edmundo Halleio | Title=Astronomiæ cometicæ Synopsis | Journal=Philosophical Transactions | Year=1705 | Volume=24 | Pages=1882–1899 }}

* [http://www.cometography.com/ cometography.com]

* [http://www.ifa.hawaii.edu/faculty/jewitt/comet.html David Jewitt overview of the comets]

* [[Open Directory Project]]: [http://www.dmoz.org/Science/Astronomy/Solar_System/Asteroids,_Comets_and_Meteors/comets/Comets]

* [http://fax.libs.uga.edu/QB721xM635/ ''ESSAY ON COMETS''], which gained the first of Dr. Fellowes's prizes, proposed to those who had attended the University of Edinburgh within the last twelve years. By David Milne. Publisher: Edinburgh, Printed for A. Black; 1828.