Sharma, Poornima, Keerti Singh, Rekha Bhatnagar, and Rohit Jain. 2018. “Assessment of Vitamin B12 Deficiency and Associated Factors in Patients Attending Tertiary Care Hospital of Southern Rajasthan”. National Journal of Community Medicine 9 (10):740-44. https://njcmindia.com/index.php/file/article/view/806.