Chiusura (topologia): differenze tra le versioni

* {{citationcita libro|firstautore=Crump W.|last= Baker|titletitolo=Introduction to Topology|yearanno=1991|publishereditore=Wm. C. Brown Publishereditore|isbn=0-697-05972-3|cid=Baker}}

* {{citationcita libro|firstautore=Fred H.|last= Croom|titletitolo=Principles of Topology|publishereditore=Saunders College Publishing|yearanno=1989|isbn=0-03-012813-7|url=https://archive.org/details/principlesoftopo0000croo|cid=Croom}}

* {{citationcita libro|firstautore=Michael C.|last= Gemignani|titletitolo=Elementary Topology|edition=2|yearanno=1990|origyearannooriginale=1967|publishereditore=Dover|isbn=0-486-66522-4|cid=Gemignani}}

* {{cita libro|autore=John G. Hocking|autore2=Gail Young|titolo=Topology|anno=1988|annooriginale=1961|editore=Dover|isbn=0-486-65676-4|url=https://archive.org/details/topology00hock_0|cid=Hocking e Young}}

* {{citationcita libro|firstautore=K.|last= Kuratowski|titletitolo=Topology|volume=I|publishereditore=Academic Press|yearanno=1966|cid=Kuratowski}}

* {{citationcita libro|firstautore=William J.|last= Pervin|titletitolo=Foundations of General Topology|yearanno=1965|publishereditore=Academic Press|cid=Pervin}}

* {{citationcita libro|firstautore=Horst|last= Schubert|titletitolo=Topology|yearanno=1968|publishereditore=Allyn and Bacon|cid=Schubert}}