Reference

	Sirius: The Brightest Diamond in Sky by Jay B. Holberg Year: 2007 Hits: 5293 Date insert: Monday, 31 December 2018
	Sky Phenomena: A Guide to Naked-Eye Observation of the Stars by Norman Davidson Year: 1993 Hits: 9970 Date insert: Monday, 31 December 2018
	Skyways Astronomy Handbook for Teachers by Mary Lou Whitehorne Year: 2003 Hits: 4932 Date insert: Monday, 31 December 2018
	Star Watch: The Amateur Astronomers Guide to Finding, Observing, and Learning about Over 125 Celestial Objects by Leslie C. Peltier, Philip S.Harrington Year: 2003 Hits: 5005 Date insert: Monday, 31 December 2018
	Stargazing with Binoculars and Telescopes by John Mosley Year: 1998 Hits: 4660 Date insert: Monday, 31 December 2018