Não informado. (1940). Engineers digest: Review of engineering progress. Engineer's Digest Publications.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Engineers Digest: Review of Engineering Progress. London: Engineer's Digest Publications, 1940.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Engineers Digest: Review of Engineering Progress. Engineer's Digest Publications, 1940.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.