Dr. Ahmad A. Alshrefen

Email: ahmed.sh@yu.edu.jo.

Email: al_shreffen@Yahoo.com

Mobile: +962 777748217.​

facebook: https://www.facebook.com/ah.alshreffen​

youtube: https://www.youtube.com/channel/UCvkkZB8rKuI_Guz8Yc3DZUw