APA (7th ed.) Citation

Popper, K. R. (1965). Conjectures and refutatuions: The growth of scientific knowledge. Harper Torchbooks.

Chicago Style (17th ed.) Citation

Popper, Karl R. Conjectures and Refutatuions: The Growth of Scientific Knowledge. New York: Harper Torchbooks, 1965.

MLA (9th ed.) Citation

Popper, Karl R. Conjectures and Refutatuions: The Growth of Scientific Knowledge. Harper Torchbooks, 1965.