MLA

Sreznevskiĭ, I. I. (Izmail Ivanovich), 1812-1880. Mysli ob istorii russkogo i︠a︡zyka. Chitano na akte Imp. S.Peterburgskogo universiteta 8-go fevrali︠a︡ 1849 goda. 1850.. https://collections.library.yale.edu/catalog/30922411.

APA, 6th edition

Sreznevskiĭ, I. I. (Izmail Ivanovich), 1812-1880. (1850.)[Mysli ob istorii russkogo i︠a︡zyka. Chitano na akte Imp. S.Peterburgskogo universiteta 8-go fevrali︠a︡ 1849 goda]. https://collections.library.yale.edu/catalog/30922411.