MLA

Krasnogorskiĭ Platon V. Zadachi Po Russkomu pravopisanīi︠u︡ s prilozhenīem orḟograficheskago slovari︠a︡ ... Obshchestvennai︠a︡ polʹza, 1885. https://collections.library.yale.edu/catalog/30992134.

APA, 6th edition

Krasnogorskiĭ Platon V. (1885). Zadachi po russkomu pravopisanīi︠u︡ s prilozhenīem orḟograficheskago slovari︠a︡ ... Obshchestvennai︠a︡ polʹza. https://collections.library.yale.edu/catalog/30992134.