Foltz, Richard (2013). Religions of Iran:From Prehistory to the Present. Oneworld Publications. стр. 95. ISBN978-1780743097. Приступљено 2017-12-18. „In the centuries before the Arab conquests Buddhism was spread throughout the eastern Iranian world. Buddhist sites have been found in Afghanistan, Turkmenistan, Uzbekistan, and Tajikistan, as well as within Iran itself.”
Woodhead, Linda; Partridge, Christopher Hugh; Kawanami, Hiroko, ур. (2016). Religions in the modern world : traditions and transformations (Third изд.). Abingdon, Oxon: Routledge. ISBN978-0415858809. OCLC916409066.