Não informado. (1958). Delta: A review of arts, life and thought in the Netherlands. Delta International Publication Foundation.
Chicago-referens (17:e uppl.)Não informado. Delta: A Review of Arts, Life and Thought in the Netherlands. Amsterdam: Delta International Publication Foundation, 1958.
MLA-referens (8:e uppl.)Não informado. Delta: A Review of Arts, Life and Thought in the Netherlands. Delta International Publication Foundation, 1958.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.