APA (7th ed.) Citation

Popper, K. [. (1999). All life is problem solving. Routledge.

Chicago Style (17th ed.) Citation

Popper, Karl [Raimund. All Life Is Problem Solving. London: Routledge, 1999.

MLA (9th ed.) Citation

Popper, Karl [Raimund. All Life Is Problem Solving. Routledge, 1999.