Harrison, I. (2004). The book of inventions: How'd they come up with that? National Geographic Society.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Harrison, Ian. The Book of Inventions: How'd They Come Up with That? Washington, D.C: National Geographic Society, 2004.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Harrison, Ian. The Book of Inventions: How'd They Come Up with That? National Geographic Society, 2004.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.