Kothari, C. R. Research methodology: metthods and techniques / C.R.Kothari and Gaurav Garg - 3rd ed. - New Delhi: Willey eastern, c1990. - xx,449p.: ill,; 24cm. Includes Index English ISBN: 978822436235 Subjects--Topical Terms: Research methods and techniques Dewey Class. No.: 001.4/KOR