Circassian language online lessons - Description of Circassian phonetics and main grammar forms, English-Circassian phrasebook. - http://zihia.narod.ru/ing/instead.htm
The Lezgian Language Site - Introduction to the Lezgian language (grammar, conversation) with basic information about the Lezgians. - http://republika.pl/lezgi
Long-Distance Agreement in Tsez - Article by Eric Potsdam and Maria Polinsky, discussing cases of agreement extending beyond the clause. - http://ling.ucsd.edu/~polinsky/pubs/lda.pdf
Ergative Case in the Circassian Languages - Paper examining the marking of ergative/absolutive case in various types of nominals subsequently relating their distribution to the nominal hierarchy. - http://www.ling.lu.se/disseminations/pdf/45/Kumachov_et_al.pdf
Udi Online Grammar - Online grammar of Udi, spoken in Northern Azerbaijan and Eastern Georgia. Contains grammatical description, samples of Spoken Udi, text collection with interlinear glosses and translation, and bibliography. - http://www.lrz-muenchen.de/~wschulze/Uog.html
Caucasian Languages - Brief profile and list of languages, some with links to further information. - http://www.peoples.org.ru/eng_kavkaz.html