APA (7th ed.) Citation

Puppe, D. (1999). Herbert Seifert*: May 27, 1907 - October 1, 1996. History of topology. https://doi.org/10.1016/B978-044482375-5/50041-9

Chicago Style (17th ed.) Citation

Puppe, Dieter. "Herbert Seifert*: May 27, 1907 - October 1, 1996." History of Topology 1999. https://doi.org/10.1016/B978-044482375-5/50041-9.

MLA (9th ed.) Citation

Puppe, Dieter. "Herbert Seifert*: May 27, 1907 - October 1, 1996." History of Topology, 1999, https://doi.org/10.1016/B978-044482375-5/50041-9.