Muhammad Khan, Syed Shahzad Ali, and Rabail Rani Soomro, “ORIGINAL ARTICLE: Efficacy of C1-C2 Sustained Natural Apophyseal Glide (SNAG) Versus Posterior Anterior Vertebral Mobilization (PAVMs) in the Management of Cervicogenic Headache”, J. Basic Appl. Sci., vol. 10, pp. 226–230, Jan. 2014.