Não informado. (1906). Engineering and contracting. Engineering and Contracting Publishing.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Engineering and Contracting. Chicago, Ill: Engineering and Contracting Publishing, 1906.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Engineering and Contracting. Engineering and Contracting Publishing, 1906.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.