Dyfyniad APA

POPPER, K. R. (1992). Conjectures and refutations: The growth of scientific knowledge.-- ed.5. Routledge and Kegan Paul.

Dyfyniad Arddull Chicago

POPPER, Karl R. Conjectures and Refutations: The Growth of Scientific Knowledge.-- Ed.5. New York: Routledge and Kegan Paul, 1992.

Dyfyniad MLA

POPPER, Karl R. Conjectures and Refutations: The Growth of Scientific Knowledge.-- Ed.5. Routledge and Kegan Paul, 1992.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.