Resources for Church Slavic/Old Church Slavonic
Reference works found on this page include works regardless of the language of publication about Old Church Slavic and Old Church Slavonic, which are two different names for the same entity. This language is sometimes referred to as Old Bulgarian as well. Publications on the later language of Church Slavic are also included here. Resources about Slavic linguistics, proto-Slavic/Common Slavic, or other Slavic languages will appear on the pages devoted to the individual languages or the General Resources for Slavic Linguistics page. Many of the resources annotated there will contain information about OCS, so you should peruse them too. Since OCS is classified as a South Slavic language, the section devoted to South Slavic Linguistics, which appears in the General Resources for Slavic Linguistics page, may also be of interest for this category. Some cross references are provided for works that could be listed under multiple categories.
Drevni︠a︡i︠a︡ Rusʹ v srednevekovom mire : ėnt︠s︡iklopedii︠a︡ / pod obshcheĭ redakt︠s︡ieĭ E.A. Melʹnikovoĭ i V.I︠A︡. Petrukhina. by 
The Encyclopedia of Eastern Orthodox Christianity by 
Rossiĭskai︠a︡ muzeĭnai︠a︡ ėnt︠s︡iklopedii︠a︡ : v dvukh tomakh / redakt︠s︡ionnai︠a︡ kollegii︠a︡ V.L. I︠A︡nin (predsedatelʹ) ... [et al.].
Encyclopedia of Russian history : from the Christianization of Kiev to the break-up of the U.S.S.R. / John Paxton. by 
Derzhava Ri︠u︡rikovicheĭ : slavi︠a︡ne, Rusʹ, Rossii︠a︡ : ėnt︠s︡iklopedicheskiĭ slovarʹ v shesti tomakh / V.V. Boguslavskiĭ ; [pod obshcheĭ redakt︠s︡ieĭ i s predisloviem V.I. Buganova]. by 
Great Soviet encyclopedia. [A. M. Prokhorov, editor in chief]. by 
