Chand, Dr. Tara . General Studies Manual 2009 / Textual Documents Dr.Tara Chand. - 2009 ed. / - N.Delhi : Tata McGraw-Hill , 2009. - Unitwise ; ISBN: 13:928-0-07-008030-5 Subjects--Index Terms: General Studies,Competitve Exams. Dewey Class. No.: 001 / Ch 361 Ge