Scientific interest of Prof. Dr. Paul J. Crutzen [online]. [Cit. 2006-04-15]. Dostupné online. Archivované 2011-08-11 z originálu.
mpic.de
The Max Planck Institute for Chemistry mourns the loss of its former director and Nobel Laureate Paul J. Crutzen [online]. mpic.de, 2021-01-28, [cit. 2021-01-28]. Dostupné online.
web.archive.org
Scientific interest of Prof. Dr. Paul J. Crutzen [online]. [Cit. 2006-04-15]. Dostupné online. Archivované 2011-08-11 z originálu.