Não informado. (1939). Advancement of Science. British Association for the Advancement of Science.
Chicago-referens (17:e uppl.)Não informado. Advancement of Science. London: British Association for the Advancement of Science, 1939.
MLA-referens (8:e uppl.)Não informado. Advancement of Science. British Association for the Advancement of Science, 1939.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.