Baerman, M. 2005, Directionality and (Un)natural Classes in Syncretism. - Language 80, 807-827.
doi:10.1353/lan.2004.0163
Baerman, M. Brown, D. 2005, Case Syncretism. - The World Atlas of Language Structures, Oxford.
Baerman, M., Brown, D. Corbett, G. C. 2005, The Syntax-Morphology Interface. A Study of Syncretism, Cambridge.
Blevins, J. 2005, Word-based declensions in Estonian. - Yearbook of Morphology 2005, 1-Ñ25.
Blevins, J. 2008, Declension Classes in Estonian. - LU XLIV, 241-265.
Campbell, L., Harris, A. C. 1995, Historical Syntax in Cross-Linguistic Perspective, Cambridge.
Dalrymple, M., Nikolaeva, I. 2006, Syntax of Natural and Accidental Coordination. Evidence from Agreement. - Language 82, 824-849.
doi:10.1353/lan.2006.0189
Grünthal, R. 2001, Homonymy and Systemacy in Estonian Noun Inflection. - Keele kannul. Pühendusteos Mati Erelti 60. sünnipäevaks 12. märtsil 2001. Tartu (Tartu Ülikooli eesti keele õppetooli toimetised 17), 42Ñ61.
Grünthal, R. 2005, Hány oka lehet a vepsze szekunder névutói eredetű helyhatározóragok suffixálódásának? - Uráli Grammatizáló. 2003. Szeptember 4-6, Budapest, 126-134.
Grünthal, R. 2007, Morphological Change and the Influence of Language Contacts in Estonian. - Beiträge zur Morphologie. Germanisch, baltisch, ostseefinnisch, Odense, 403-432.
Haspelmath, M. 1998, Does Grammaticalization Need Reanalysis? - Studies in Language 22:2, 315Ñ351.
Haspelmath, M. 2008, Creating Economical Morphosyntactic Patterns in Language Change. - Language Universals and Language Change, Oxford, 185-214.
Heath, J. 1998, Hermit Crabs. Formal Renewal of Morphology by Phonologically Mediated Affix Substitution. - Language 74, 728-759.
doi:10.2307/417001
Johnston, J. 1997, Systematic Homonymy and the Structure of Morphological Categories. Some Lessons from Paradigm. PhD thesis, University of Sydney. http://ses.library.usyd.edu.au/bitstream/2123/396/1/adt-NU1999.0013whole.pdf.
Luraghi, S. 2008, Synkretismus. - Morphologie. Ein Handbuch zur Flexion und Wortbildung, Berlin, 638-647.
Nevis, J. 1988, On the Development of the Clitic Postposition Category in Estonian. - FUF 48, 171-197.
Ravila, P. 1941, Über die Verwendung der Numeruszeichen in den uralischen Sprachen. - FUF 27, 1-136.
Tikka, T. 1992, Vepsän suffiksoituneet postpositiot. Kieliopillisiin sijoihin liittyvä suffiksoituminen, Uppsala (Studia Uralica Upsaliensia 22).
Майтинская К. Е. 1979, Морфология финно-угорскиx языков, Москва.