Kothri, C R Research Methodology : Methods and Techniques / C. R. Kothari - 4th, ed. - Lon Don : Publishers, 2019 - 458 p. ; 28 cm. ISBN: 9788122436235 Subjects--Topical Terms: ResearchMethodologySocial sciences Subjects--Index Terms: Phương pháp nghiên cứu Dewey Class. No.: 001.42 / KOT