APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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