On being free / Frithjof Bergmann. Bergmann, Frithjof. Liberty. JC571 .B474 123 BER Notre Dame : University of Notre Dame Press, c1977. c1977. 1977 Text xi, 238 p. ; https://www.loc.gov/catdir/enhancements/fy1612/77089760-b.html https://www.loc.gov/catdir/enhancements/fy1612/77089760-d.html eng