1. Berlinski, D.: On Systems Analysis. MIT Press, Cambridge, MA (1976)
2. Blauberg, I.V., Sadovsky, V.N., Yudin, E.G.: Systems Theory, Philosophical and Methodological Problems. Progress Publishers, Moscow (1977)
3. Bunge, B.: Treatise on Basic Philosophy, vol. 4. A World of Systems. Reidel, Dordrecht, Holland (1979)
4. Engelking, R.: General Topology. Polish Scientific Publishers, Warszawa (1975)
5. Gratzer, G.: Universal Algebra. Springer, New York (1978)