Gaya APA

POPPER, K, R. (1972). Conjectures and Refutations : The Growth of Scientific Knowledge (Fourth Edition). London: Routledge & Kegan Paul.

Gaya MLA

POPPER, Karl, R.. "Conjectures and Refutations : The Growth of Scientific Knowledge". Fourth Edition London: Routledge & Kegan Paul, 1972. Text.