Shekhar, Shashi Spatial databases : a tour / Shashi Shekhar and Sanjay Chawla - 3rd ed. - New Delhi : Pearson, c2009. - xxiii, 262 p. : ill. ; 25 cm. ISBN: 9788131726280 LCCN: Subjects--Topical Terms: Geographic information systems LC Class. No.: G70.212 / .S54 2009