Agarwal, Chetan Encyclopaedia of research methodology. - New Delhi : Commonwealth Publishers, 2011. - v,283p. - Volume 9: Research methodology in history . ISBN: 9788131103432 10000 Source: 1742, 14/02/2012, Kiran Book Service Textual Subjects--Topical Terms: Hindi Dewey Class. No.: Σ:fk Q1.9 RR