Preface (Korean)
(2016)
Introducció
(2009)
Introducción
(2007)
Introducción
(2003)
Foreword (Typescript, 2 pp.)
(1978)
Prefazione (2 pp.)
(1978)
Editorial
(1971)
Introduction in Adam Schaff >Marxism and the Human Individual< (Typescript for publication, 8 pp.)
(1970)
(Foreword, Chinese)
(1960)
Preface to Philosophy and Revolution, New York (Columbia University Press), 1989, pp xxi-xxii.
(1981)
Vorwort
(1981)