1. Harding AJ (1959) Ammonia manufacture and uses, Oxford University Press, London.
2. Vancini CA (1961) La Sintesi dell’Ammoniaca. Ulrico Hoepli, Milano.
3. Sauchelli V, Stevenson FJ, Timm B, Danz W, Axelrod LC, O’Hare TE, Hansen HJ (1964) In: Sauchelli V (ed) Fertilizer nitrogen its chemistry and technology. Reinhold, New York.
4. Vancini CA (1971) Synthesis of ammonia. Macmillan, London.
5. LeBlanc JR Jr, Madhavan S, Porter RE (1978) In: Kirk-Othmer Encyclopedia of Chemical Technology, 3rd ed. Wiley, New York, vol 2, p 470.