Francis, S. (1987). Premeir IAS General Studies (8th ed ed.). CBS College.
Chicago Style aipamenaFrancis, SRS. Premeir IAS General Studies. 8th ed ed. New Delhi: CBS College, 1987.
MLA aipamenaFrancis, SRS. Premeir IAS General Studies. 8th ed ed. CBS College, 1987.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.