Reference

	David Levy’s Guide to Observing and Discovering Comets by Thierry Legault, Steven James O’Meara Year: 2003 Hits: 7024 Date insert: Monday, 31 December 2018
	Deep Sky Companions: The Secret Deep by Thierry Legault, Thierry Legault, Steven James O’Meara, Steven James O’Meara Year: 2011 Hits: 4665 Date insert: Monday, 31 December 2018
	Explore the Universe Guide by Brenda Shaw Year: 2018 Hits: 4509 Date insert: Monday, 31 December 2018
	Exploring the Moon Through Binoculars and Small Telescopes by Ernest H. Cherrington, Jr. NA Year: 1984 Hits: 4893 Date insert: Monday, 31 December 2018
	Guide to Observing the Moon by British Astronomical Association Year: 1986 Hits: 4998 Date insert: Monday, 31 December 2018