Conjectures and Refutations: The Growth Of Scientific Knowledge by Karl Popper

Objective Knowledge An Evolutionary Approach By Karl R. Popper Vintage Paperback

THE OPEN SOCIETY AND ITS ENEMIES Volume 1 by Karl R. Popper - PHILOSOPHY PLATO

1968 Conjectures and Refutations by Karl R. Popper Paperback Book

1981 Objective Knowledge by Karl R. Popper Revised Edition Paperback Book

The Poverty Of Historicism By Popper R. Karl Vintage Paperback 1964 Harper & Row

Racionalidad Lenguaje y Filosofia Hugo Margain 1978 Fondo de Cultura Economica