Editorial
(1965)
Editorial
(1968)
Editorial
(1971)
Afterword
(1961)
A Nuestros Lectores
(1973)
(Introduction, Japanese)
(1965)
(Introduction, hrv)
(1965)
(Introduction, Hebrew)
(1965)
(Introduction, Greek)
(1965)
(Foreword, Swedish)
(1960)
(Foreword, Serbocroatic)
(1960)
(Foreword, Japanese)
(1960)
(Foreword, Hebrew)
(1960)
(Foreword, Greek)
(1960)
(Foreword, Chinese)
(1960)
(Foreword, Chinese)
(1960)
(Foreword, Chinese)
(1960)
(Foreword, Arabic)
(1960)