Suku Nuristan yang terletak bersebelahan dengan suku ini di Nuristan (sebelumnya disebut Kafiristan) pernah menganut agama yang sama dengan suku Kalash.[4][6] Pada akhir abad ke-19, sebagian besar wilayah Nuristan telah diislamkan, walaupun terdapat bukti bahwa beberapa orang masih meneruskan adat istiadat mereka.[6] Seiring berjalannya waktu, perang di wilayah Nuristan mengakibatkan kematian banyak orang Nuristan dan orang-orang Afgan dari sekitar mulai memasuki wilayah ini untuk mengisi kekosongan penduduk.[10][11][12] Di sisi lain, suku Kalash di Chitral tetap dapat menjaga tradisi budaya mereka.[13]
^ abCamerapix (1998). Spectrum Guide to Pakistan. Interlink Books. ISBN978-1-56656-240-9. Nowhere is this more evident than among the pagan Kalash, a non-Islamic community living in the isolated valleys of Chitral whose faith is founded on animism.
^ abSean Sheehan (1 October 1993). Pakistan. Marshall Cavendish. ISBN978-1-85435-583-6. The Kalash people are small in number, hardly exceeding 3,000, but they ... and as well as having their own language and costume, they practice animism (the worship of spirits in nature)...
^ abcWest, Barbara A. (19 May 2010). Encyclopedia of the Peoples of Asia and Oceania (dalam bahasa English). Infobase Publishing. hlm. 357. ISBN9781438119137. The Kalasha are a unique people living in just three valleys near Chitral, Pakistan, the capital of North-West Frontier Province, which borders Afghanistan. Unlike their neighbors in the Hindu Kush Mountains on both the Afghani and Pakistani sides of the border the Kalasha have not converted to Islam. During the mid-20th century a few Kalasha villages in Pakistan were forcibly converted to this dominant religion, but the people fought the conversion and once official pressure was removed the vast majority continued to practice their own religion. Their religion is a form of Hinduism that recognizes many gods and spirits ... given their Indo-Aryan language, ... the religion of the Kalasha is much more closely aligned to the Hinduism of their Indian neighbors that to the religion of Alexander the Great and his armies.Parameter |access-date= membutuhkan |url= (bantuan)Pemeliharaan CS1: Bahasa yang tidak diketahui (link)
^Bezhan, Frud (19 April 2017). "Pakistan's Forgotten Pagans Get Their Due" (dalam bahasa English). Radio Free Europe/Radio Liberty. Diakses tanggal 11 July 2017. About half of the Kalash practice a form of ancient Hinduism infused with old pagan and animist beliefs.Pemeliharaan CS1: Bahasa yang tidak diketahui (link)
^ abcdMinahan, James B. (10 February 2014). Ethnic Groups of North, East, and Central Asia: An Encyclopedia (dalam bahasa English). ABC-CLIO. hlm. 205. ISBN9781610690188. Diakses tanggal 26 June 2016. Living in the high mountain valleys, the Nuristani retained their ancient culture and their religion, a form of ancient Hinduism with many customs and rituals developed locally. Certain deities were revered only by one tribe or community, but one deity was universally worshipped by all Nuristani as the Creator, the Hindu god Yama Raja, called imr'o or imra by the Nuristani tribes. Around 700 CE, Arab invaders swept through the region now known as Afghanistan, destroying or forcibly converting the population to their new Islamic religion. Refugees from the invaders fled into the higher valleys to escape the onslaught. In their mountain strongholds, the Nuristani escaped conversion to Islam and retained their ancient religion and culture. The surrounding Muslim peoples used the name Kafir, meaning "unbeliever" or "infidel," to describe the independent Nuristani tribes and called their highland homeland Kafiristan. The Nuristani are sometimes called Kalasha though this name is more appropriate for the closely related Kalash in the neighboring Chitral region of Pakistan. The differences between the Nuristani and the Kalash are religious as the Kalash mostly retain their ancient religious beliefs.Pemeliharaan CS1: Bahasa yang tidak diketahui (link)
^Pakistan Statistical Year Book. 2012. Pakistan Bureau of Statistics. Karachi: Manager of Publications
Kalasha HeritageDiarsipkan 2013-11-09 di Wayback Machine. A website used by the Kalasha people to promote, conserve and protect the Kalasha tangible and intangible heritage