1. 1. Standring S. Gray's Anatomy: Anatomical Basis of Clinical Practice. 39th Ed., London, Elsevier Churchill-Livingstone. 2005; 455-465.
2. 2. VP Girish, Shishirkumar. Bony tubercle on the Anterior Border of Foramen Magnum. IJSR. 2014; 13 (8): 57-58.
3. 3. Prakash BS, Padma LK, Jagdish LM, Ramesh BR. A tubercle at the anterior margin of foramen magnum. IJAR. 2011; 4: 118-119.
4. 4. Lombardi G. The occipital vertebra. Am J Roentgenol Radium Ther Nucl Med. 1961; 86: 260-269.
5. 5. Vasudeva N, Choudhry R. Precondylar tubercles on the basiocciput of adult human skulls. J Anat. 1996; 188: 207-210.