MLA

Volkov I︠A︡. Alfavitnyĭ Sbornik Russkikh Nepravilʹnykh Glagolov. Emilʹ Gartʹe, 1881. https://collections.library.yale.edu/catalog/30696201.

APA, 6th edition

Volkov I︠A︡. (1881). Alfavitnyĭ sbornik russkikh nepravilʹnykh glagolov. Emilʹ Gartʹe. https://collections.library.yale.edu/catalog/30696201.