1. Shankar L, Evans K. An Atlas of Imaging of the Paranasal Sinuses. 2nd ed. Lippincott Williams & Wilkins; 2009. p. 28
2. Kirtane MV, de Souza CE. Rhinology and Endoscopic Skull Base Surgery. Thieme; 2013. p. 8
3. Mclay K, Maran AGD, Dale BAB, Cowan DL, Kerr AIG. Logan Turner’s. Diseases of the Nose, Throat and Ear. 9th ed. John Wright & Sons; 1982. pp. 9-11
4. Bradoo R. Anatomical Principal of Endoscopic Sinus Surgery: A Step by Step Approach. 1st ed. Jaypee Brothers Medical Publishers; 2016. p.78
5. Dhingra PL, Dhingra S. Disease of Ear, Nose and Throat & Head and Neck Surgery. 6th ed. Elsevier; 2014. pp. 140-141