1. Ayman Ali Omar, Readings in Consumer Behaviour, University House, Alexandria, Egypt 2006, p. 16.
2. Gamal Al-Sayed Al-Ahwal - The Art of Jewelery between Theory and Practice - Doctor at the Faculty of Applied Arts - Helwan University -2009, p. 12.
3. Ziyad Muhammad Al-Sharman, Abdul Ghafoor Abdullah Abdul Salam, p. 78.
4. Talaat Asaad Abdel Hamid, Effective Marketing, How to Facing the Challenges of the 21st Century - 2008, p. 22.
5. Dr. Abdel Aal Mohamed Abdel Aal - Movement as an artistic value in jewelry design - PhD thesis - Faculty of Applied Arts - Helwan University 1983.
6. Naim Al-Abed Ashour, Rashid Nimer Odeh: p. 39
7. Whan Al-Saeed: The role of price in guiding customers’ purchasing decisions, memorandum for obtaining a master’s degree, Faculty of Economics, Commercial and Management Sciences, Al-Masalla University, 2013, p. 28.Stephanie Pappas “Personality Traits & Personality Types: What is Personality? www.livescience.com 2018.