Viitso, T.-R. 2014. Expressions of obligation, duty, and necessity in Livonian. Eesti ja soome-ugri keeleteaduse ajakiri. Journal of Estonian and Finno-Ugric Linguistics. 5, 1 (Jul. 2014), 193–214. DOI:https://doi.org/10.12697/jeful.2014.5.1.10.