Foreword
(1949)
Poslowie
(2015)
Foreword
(1962)
Vorwort
(2019)
Nachwort
(1995)
Preface
(1950)
Nachwort
(1994)
Éditorial
(2004)
Preface
(1967)
Editor's Foreword
(1972)
Vorwort des Herausgebers
(1973)
Vorwort
(1975)
Preface
(1974)
Foreword
(1970)
Preface
(1976)
Vorwort
(1974)
Preface
(1977)
Preface
(1961)