APA
(1997). General Studies Manual. Tata Mc-Graw, New Delhi: .
Chicago
1997. General Studies Manual. Tata Mc-Graw, New Delhi: .
Harvard
(1997). General Studies Manual. Tata Mc-Graw, New Delhi: .
MLA
General Studies Manual. Tata Mc-Graw, New Delhi: . 1997.