1. Ibrahim Al-Zahrani (2011): Intellectual Security: Its Concept, Importance, and Fields, Journal of Security Research, Volume 20, P 50, King Fahd Security College - Research and Studies Center.
2. Ibrahim Salman (2018): The role of school administrations in enhancing the intellectual security of learners: a field study on public schools in the city of Alkhalil, Journal of Human Sciences, p.10, Al-Arabi Bin Mahidi University - Umm Al-Bouaghi.
3. Abu Abdullah Muhammad Ibn Ismail al-Bukhari (1988): Al-Jami al-Sahih with Al-Fath, edited by: Moheb Al-Din Al-Khatib, Second Edition, Dar Al-Rayyan Heritage, Cairo, Book of Hadiths of the Prophets - Chapter of God Almighty saying: "وإلى عاد أخاهم هودا يا قوم اعبدوا الله" 6/433 H 3344.
4. Abu Issa Muhammad ibn Issa al-Tirmidhi, al-Jami al-Sahih (1962): Edited by: Ibrahim Atwa Awad, First Edition, Egypt: Mustafa Al-Babi Al-Halabi and Sons Bookstore Company, Book of Zuhd 4/574 H 2346.
5. Editing Department of Al-Islah Magazine (2013): Intellectual Security and Contemporary Challenges, Volume 7, P35, Dar Al-Fadila for Publishing and Distribution.