Waddell, J. A. L. (1904). The relations of civil engineering to other branches of science: An address to the International congress of arts and science at the universal exposition, St. Louis, Mo., September 21, 1904. Press of the J. D. Havens company.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Waddell, J. A. L. The Relations of Civil Engineering to Other Branches of Science: An Address to the International Congress of Arts and Science at the Universal Exposition, St. Louis, Mo., September 21, 1904. Kansas City: Press of the J. D. Havens company, 1904.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Waddell, J. A. L. The Relations of Civil Engineering to Other Branches of Science: An Address to the International Congress of Arts and Science at the Universal Exposition, St. Louis, Mo., September 21, 1904. Press of the J. D. Havens company, 1904.