Não informado. (1940). Engineers digest: Review of engineering progress. Engineer's Digest Publications.
Chicago-Zitierstil (17. Ausg.)Não informado. Engineers Digest: Review of Engineering Progress. London: Engineer's Digest Publications, 1940.
MLA-Zitierstil (8. Ausg.)Não informado. Engineers Digest: Review of Engineering Progress. Engineer's Digest Publications, 1940.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.