MLA

Smirnovskīĭ, P. (Petr), 1846-. Grammatikva drevni︠a︡go t︠s︡erkovno-slavi︠a︡nskago i︠a︡zyka : izlozhennai︠a︡ sravnitelʹno s russkoi︠u︡. 1883.. https://collections.library.yale.edu/catalog/30763205.

APA, 6th edition

Smirnovskīĭ, P. (Petr), 1846-. (1883.)[Grammatikva drevni︠a︡go t︠s︡erkovno-slavi︠a︡nskago i︠a︡zyka : izlozhennai︠a︡ sravnitelʹno s russkoi︠u︡]. https://collections.library.yale.edu/catalog/30763205.