Edgar Thorpe and Showick Thorpe. (2016). General Studies Paper I for the Civil Service Preliminary Examination, Vol.III: Geography & Environmental Ecology.
Chicago Style aipamenaEdgar Thorpe and Showick Thorpe. General Studies Paper I for the Civil Service Preliminary Examination, Vol.III: Geography & Environmental Ecology. Pearson : New Delhi, 2016.
MLA aipamenaEdgar Thorpe and Showick Thorpe. General Studies Paper I for the Civil Service Preliminary Examination, Vol.III: Geography & Environmental Ecology. 2016.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.