Não informado. (1958). Delta: A review of arts, life and thought in the Netherlands. Delta International Publication Foundation.
Lua i Stíl Chicago (17ú heag.)Não informado. Delta: A Review of Arts, Life and Thought in the Netherlands. Amsterdam: Delta International Publication Foundation, 1958.
Lua MLA (8ú heag.)Não informado. Delta: A Review of Arts, Life and Thought in the Netherlands. Delta International Publication Foundation, 1958.
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