Gaya APA
Popper, K, R. (1959).
Conjectures and refutations: The growth of scientific know- ledge. .
London:
London Routledge & Kegan Paul.
Gaya MLA
Popper, Karl, R..
"Conjectures and refutations: The growth of scientific know- ledge. ".
London:
London Routledge & Kegan Paul,
1959.
Buku.