Ulrike Quapp และ Klaus Holschemacher. (2016) PROFESSIONAL ETHICS IN THE DAILY WORKING PRACTICE OF CIVIL AND STRUCTURAL ENGINEERS. ISEC Press:ม.ป.ท.Ulrike Quapp และ Klaus Holschemacher. 2016. PROFESSIONAL ETHICS IN THE DAILY WORKING PRACTICE OF CIVIL AND STRUCTURAL ENGINEERS. ม.ป.ท.:ISEC Press;Ulrike Quapp และ Klaus Holschemacher. PROFESSIONAL ETHICS IN THE DAILY WORKING PRACTICE OF CIVIL AND STRUCTURAL ENGINEERS. ม.ป.ท.:ISEC Press, 2016. Print.