Jørgensen, J. N., and S. Varga. “Norms and Practices of Polylingual Behaviour: A Sociolinguistic Model”. Eesti Ja Soome-Ugri Keeleteaduse Ajakiri. Journal of Estonian and Finno-Ugric Linguistics, vol. 2, no. 2, Dec. 2011, pp. 49-68, doi:10.12697/jeful.2011.2.2.03.