APA (7th ed.) Citation

Popper, K. R. (2019). Archivmaterialien zu Karl R. Popper, 1902-1994.

Chicago Style (17th ed.) Citation

Popper, Karl R. Archivmaterialien Zu Karl R. Popper, 1902-1994. 2019.

MLA (8th ed.) Citation

Popper, Karl R. Archivmaterialien Zu Karl R. Popper, 1902-1994. 2019.

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