E. ČECH: Topological Space. Academia Prague 1966.
 M. HUŠEK: Construction of special functors and its applications
. Comment. Math. Univ. Carolinae 8 (1967), 555-566. MR 0222136
 J. CHVALINA, M. SEKANINA: Realizations of closure spaces by set systems
. Proceedings of the 3rd Prague Toposymposium. Zbl 0335.54001
 S. MAC LANE: Categories for the Working Mathematician
. Springer - Verlag, New York 1971. MR 0354798
| Zbl 0232.18001
 A. PULTR: On selecting of morphisms among all mappings between underlying sets of objects in concrete categories and realizations of these
. Comment. Math. Univ. Carolinae 8 (1967), 53-83. MR 0210764
| Zbl 0166.27502
 J. ROSICKÝ, M. SEKANINA: Realizations of topologies by set-systems. Proceedings of Colloquium on Topology, Keszthely 1972.
 M. SEKANINA: Realizations of ordered sets by means of universal algebras, especially by semigroups
. Theory of sets and topology, Berlin 1972. MR 0340153
 M. SEKANINA: Graphs and the notion of betweenness. to appear.