MLA

Petrov, K. (Konstantin). Sistematicheskīĭ ukazatelʹ k sochinenīi︠a︡m Bi︠e︡linskago : posobīe pri izuchenīi teorīi i istorīi slovesnosti. 1861-62.. https://collections.library.yale.edu/catalog/31400257.

APA, 6th edition

Petrov, K. (Konstantin). (1861-62.)[Sistematicheskīĭ ukazatelʹ k sochinenīi︠a︡m Bi︠e︡linskago : posobīe pri izuchenīi teorīi i istorīi slovesnosti]. https://collections.library.yale.edu/catalog/31400257.