APA (7 ম সংস্করণ) উদ্ধৃতি

Nielsen, A. (1968). An investigation on promoted iron catalysts for the synthesis of ammonia (3rd ed.). Gjellerup.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Nielsen, Anders. An Investigation on Promoted Iron Catalysts for the Synthesis of Ammonia. 3rd ed. Kobenhavn: Gjellerup, 1968.

M.L.A (8 ম সংস্করণ) উদ্ধৃতি

Nielsen, Anders. An Investigation on Promoted Iron Catalysts for the Synthesis of Ammonia. 3rd ed. Gjellerup, 1968.