1. Grant's Atlas of Anatomy;Anderson,1978
2. Transfacial approaches to the craniovertebral junction;Beals,1998
3. Posterior skull base transfacial approaches;Beals;Clin Plast Surg,1995
4. Secondary skull base surgery;Beals;Clin Plast Surg,1997
5. Gray's Anatomy;Goss,1966