APA (7th ed.) Citation

Alt, J. A. (1992). Karl R. Popper. Campus-Verl.

Chicago Style (17th ed.) Citation

Alt, Jürgen August. Karl R. Popper. Frankfurt am Main [u.a.]: Campus-Verl, 1992.

MLA (8th ed.) Citation

Alt, Jürgen August. Karl R. Popper. Campus-Verl, 1992.