APA استشهاد

Geiges, H. (2008). Introduction to contact topology. Cambridge University Press.

استشهاد بنمط شيكاغو

Geiges, Hansjorg. Introduction to Contact Topology. Cambridge ; New York: Cambridge University Press, 2008.

MLA استشهاد

Geiges, Hansjorg. Introduction to Contact Topology. Cambridge University Press, 2008.