ScienceDirect (Online service). Topology and its applications. North-Holland Pub. Co.
Cita Chicago (17th ed.)ScienceDirect (Online service). Topology and Its Applications. Amsterdam: North-Holland Pub. Co.
Cita MLA (8th ed.)ScienceDirect (Online service). Topology and Its Applications. North-Holland Pub. Co.
Atenció: Aquestes cites poden no estar 100% correctes.