Berlin, Isaiah, 1909-1997. Four essays on liberty. - London, New York [etc.] Oxford U.P., 1969. - lxiii, 213 p. 21 cm. - Oxford paperbacks, 116 . Bibliographical footnotes. ISBN: 0192810340 Subjects--Topical Terms: Liberty. LC Class. No.: JC585 / .B418 1969b Dewey Class. No.: 301.15