1. G. E. Andrews, The Theory of Partitions (Addison-Wesley, London, 1976; Nauka, Moscow, 1982).
2. G. Gratzer, General Lattice Theory (Akademie, Berlin, 1978; Mir, Moscow, 1982).
3. M. Aigner, Combinatorial Theory (Springer-Verlag, Heidelberg, 1979; Mir, Moscow, 1982).
4. M. O. Asanov, V. A. Baransky, and V. V. Rasin, Discreete Mathematics: Graphs, Matroids, Algorithms (RKhD, Izhevsk, 2001) [in Russian].