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1
Date [1962]
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2Omslagtit.: Unite or perish = Unir ou périr“…London: International Committee of Study and Action for the United Socialist States of Europe…”
Date [1948]
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3“…London: Socialist International (SI)…”
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4
Date 1969
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5Circular No. 100/51“…London: Socialist International…”
Date 1951
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6
Date 1985
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7
Date 1986
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8Bibliotheek Camille Huysmans“…London: Socialist International…”
Date [1962]
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9
Date 1992