Arup Group Ltd. (2013). 50 design questions answered. Arup Design Book produced and published for Arup by Wardour.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Arup Group Ltd. 50 Design Questions Answered. London, United Kingdom: Arup Design Book produced and published for Arup by Wardour, 2013.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Arup Group Ltd. 50 Design Questions Answered. Arup Design Book produced and published for Arup by Wardour, 2013.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.