Gomaa Sulaiman, Najua Ferrara, Ali Elbahi, and Salah Elbaruni. 2023. “Vitamin B12 Deficiency in Type 2 Diabetes Patients Using Metformin”. AlQalam Journal of Medical and Applied Sciences, April, 160-65. https://journal.utripoli.edu.ly/index.php/Alqalam/article/view/232.