Pen, J.

Among economists Pen, J. 1985 HARMONY AND CONFLICT IN MODERN SOCIETY PEN.J. 1966 Harmony and conflict in modern society Pen, J. 1966 Modern Economics Pen, J. 1980 Modern economics Pen, J. 1965 Modern economics Pen, J. 1958 Modern Economics Pen.J Year not listed Modern economics Pen, J. 1969