توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

(2020). International patent classification (IPC): An effective and easy-to-use system to classify and search patent documents. World Intellectual Property Organization.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

International Patent Classification (IPC): An Effective and Easy-to-use System to Classify and Search Patent Documents. Geneva, Switzerland: World Intellectual Property Organization, 2020.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

International Patent Classification (IPC): An Effective and Easy-to-use System to Classify and Search Patent Documents. World Intellectual Property Organization, 2020.