1. A. A. Albert,On ordered algebras, Bull. Am. Math. Soc.45 (1940), 521–522.
2. A. A. Albert,A property of ordered rings, Proc. Am. Math. Soc.8 (1957), 128–129.
3. P. M. Cohn,Skew Field Constructions, London Math. Soc., Lecture Note Series 27, 1973.
4. R&E, 1982;J. Dauns,1982
5. L. Fuchs,Partially Ordered Algebraic Systems, Pergamon Press, Oxford, London, New York, Paris, 1963.