1. Frankfurter O. The Attitudes of the Buddha. Journal of Siam Society. 1913;10.2:1–35.
2. Hargreaves H. Handbook to the Sculptures in the Peshawar Museum. Calcutta: Government of India Central Publication Branch; 1930. Available at: https://archive.org/details/in.gov.ignca.22478
3. Ihsan Ali, Muhammad Naeem Qazi (eds) Gandharan Sculptures in the Peshawar Museum (Life Story of Buddha). Pakistan: Hazara University Mansehra NWFP; 2008. Available at: https://archive.org/details/GandharanSculpturesInPeshawarMuseum.
4. Luce G. H. Old Burma – Early Pagan. Vol. 1: Text. New York: J. J. Augustin Publisher for Artibus Asiae and the Institute of Fine Arts, New York University; 1969.
5. Kieffer-Pulz P. Rules for the sima Regulation in the Vinaya and its Commentaries and their Application in Thailand. Journal of the International Association of Buddhist Studies. 1997;20(2):141–153.