1. P.M. Cohn, Free products of skew fields, J. Austral. Math. Soc. 16 (1973) 300–308
2. P.M.Cohn, Algebra II, J. Wiley (Chichester 1977)
3. P.M.Cohn, Skew field constructions, LMS Lecture Notes No.27, Cambridge University Press (Cambridge 1977)
4. P.M.Cohn, The universal field of fractions of a semifir III, Centralizers and normalizers, to appear
5. P.M.Cohn, Universal algebra, Harper + Row (New York 1965), new ed. in preparation D.Reidel (Dordrecht)