Reference

	Observing the Constellations: An A-Z Guide for the Amateur Astronomer by John Sanford Year: 1990 Hits: 4715 Date insert: Monday, 31 December 2018
	Observing the Night Sky with Binoculars by Thierry Legault, Steven James O’Meara Year: 2008 Hits: 23506 Date insert: Monday, 31 December 2018
	Observing the Sun by Peter O. Taylor Year: 2008 Hits: 4839 Date insert: Monday, 31 December 2018
	Patrick Moore on Mars by Terence Dickinson, Stephen James O’Meara Year: 1999 Hits: 5297 Date insert: Monday, 31 December 2018
	Patterns in the Sky: An Introduction to Stargazing by Ken Hewitt White Year: 2007 Hits: 6395 Date insert: Monday, 31 December 2018