von Fieandt, Rainer. www.blf.fi [online]. [cit. 2019-02-28]. Dostupné online.
google.cz
books.google.cz
LENTZ, Harris M. Heads of States and Governments Since 1945. [s.l.]: Routledge 925 s. Dostupné online. ISBN9781134264902. (anglicky) Google-Books-ID: D6HKAgAAQBAJ.