APA (7 ম সংস্করণ) উদ্ধৃতি

RIDGLEY, D. C. (1938). Influence Of Geographiiiy On Our Economic Life Douglas C. Ridgley And Sidney E. Ekblaw. The Gregg.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

RIDGLEY, Douglas C. Influence Of Geographiiiy On Our Economic Life Douglas C. Ridgley And Sidney E. Ekblaw. The Gregg, 1938.

M.L.A (8 ম সংস্করণ) উদ্ধৃতি

RIDGLEY, Douglas C. Influence Of Geographiiiy On Our Economic Life Douglas C. Ridgley And Sidney E. Ekblaw. The Gregg, 1938.