Não informado. (1940). Engineers digest: Review of engineering progress. Engineer's Digest Publications.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Engineers Digest: Review of Engineering Progress. London: Engineer's Digest Publications, 1940.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Engineers Digest: Review of Engineering Progress. Engineer's Digest Publications, 1940.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.