Sao chổi Halley
Tham khảo
- Stoyan, Ronald (2015), Atlas of Great Comets, Cambridge: Cambridge University Press, ISBN 978-1-107-09349-2, OCLC 897445176
- Jr., Richard Schmude, (2010), Comets and How to Observe Them, New York: Springer, ISBN 978-1-4419-5789-4, OCLC 489634788CS1 maint: extra punctuation (link)
