Munkres, James R. (2000). Topology (2nd ed.). Upper Saddle River, NJ: Prentice Hall. Willard, Stephen (2016). General topology. Dover books on mathematics. Mineola, N.Y: Dover publications. Armstrong, M. A. (1983). Basic topology. Undergraduate texts in mathematics. New York: Springer-Verlag.
munkreS, jAMeS r. (2000). ToPologY (2Nd ED.). Upper SaddlE River, Nj: prEnticE hAll. wiLlard, Stephen (2016). General topoLoGy. Dover BOoks on mathemaTiCS. mINeolA, n.y: dOvEr pubLicATionS. aRmstROng, M. a. (1983). basic ToPolOgY. undergRAduAtE TextS in mAtheMatICs. New yOrK: spriNger-verlAg.