- Primary sources collected at/in:
- Chaikovskii Estate-Museum, Votkinsk, RU
- Udmurt National Museum, Izhevsk, RU
- Kalashnikov Museum, Izhevsk, RU
- Idnakar, Glazov, RU
- Glazov Cultural Center, Glazov, RU
- Ozh-Purga, RU
- Zav'yalovo, RU
- Google Maps
- US Census Data for Cambridge, Massachusetts
- Sources: Education in Udmurt and Chuvash as minority Languages in Russia
- Russian Federal State Statistics Service (2011). "Всероссийская перепись населения 2010 года. Том 1" [2010 All-Russian Population Census, vol. 1]. Всероссийская перепись населения 2010 года (2010 All-Russia Population Census) (in Russian). Federal State Statistics Service. Retrieved June 29, 2012.
- World Directory of Minorities: Udmurts
http://www.justice.gov/sites/default/files/eoir/legacy/2014/02/19/Udmurts.pdf