Não informado. (1939). Advancement of Science. British Association for the Advancement of Science.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Advancement of Science. London: British Association for the Advancement of Science, 1939.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Advancement of Science. British Association for the Advancement of Science, 1939.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.