Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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