Não informado. (1958). Delta: A review of arts, life and thought in the Netherlands. Delta International Publication Foundation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Delta: A Review of Arts, Life and Thought in the Netherlands. Amsterdam: Delta International Publication Foundation, 1958.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Delta: A Review of Arts, Life and Thought in the Netherlands. Delta International Publication Foundation, 1958.
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