APA (7th ed.) Citation

Döring, E. (1980). Der liberale Philosoph Karl R. Popper. Liberal <Berlin>.

Chicago Style (17th ed.) Citation

Döring, Eberhard. "Der Liberale Philosoph Karl R. Popper." Liberal <Berlin> 1980.

MLA (8th ed.) Citation

Döring, Eberhard. "Der Liberale Philosoph Karl R. Popper." Liberal <Berlin>, 1980.

Warning: These citations may not always be 100% accurate.