Não informado. (2004). Expedition to South-West Arabia, 1937-1938. Trustees of the British Museum.
Chicago-referens (17:e uppl.)Não informado. Expedition to South-West Arabia, 1937-1938. London: Trustees of the British Museum, 2004.
MLA-referens (8:e uppl.)Não informado. Expedition to South-West Arabia, 1937-1938. Trustees of the British Museum, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.