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[2] Burde, G., Zieschang, H.: Knots. Studies in Mathematics, de Gruyter, Berlin, 1985.

[3] Raymond Lickorysh, W. B.: An Introduction of Knot Theory. Graduate Texts in Mathematics (175), Springer, 1997.

[4] Reidemeister, K.: Knotentheorie. Eregebnisse der Matematik und ihrer Grenzgebiete, Springer-Verlag, Berlin, 1932.

[5] Scharein, R. G.: Interactive Topological Drawing. PhD Thesis, Department of Computer Science, The Univerisity of British Columbia, 1998.

[6] Willard, S.: General Topology. Dover Books on Mathematics, Dover Publications, 2012. MR 2048350