MLA

Savvaitov, P. I. (Pavel Ivanovich), 1815-1895. O Zyri︠a︡nskikh derevi︠a︡nnykh kalendari︠a︡kh i o Permskoĭ azbuki︠e︡ : izobri︠e︡tennoĭ Svi︠a︡tym Stefanom. 1873.. https://collections.library.yale.edu/catalog/30692481.

APA, 6th edition

Savvaitov, P. I. (Pavel Ivanovich), 1815-1895. (1873.)[O Zyri︠a︡nskikh derevi︠a︡nnykh kalendari︠a︡kh i o Permskoĭ azbuki︠e︡ : izobri︠e︡tennoĭ Svi︠a︡tym Stefanom]. https://collections.library.yale.edu/catalog/30692481.