MLA

Umozritelʹnyi︠a︡ izsli︠e︡dovanīi︠a︡ Imperatorskoĭ Sanktpeterburgskoĭ akademīi Nauk 1815 / T.4. Pri Imperatorskoĭ akademīi nauk, 1808. https://collections.library.yale.edu/catalog/30665415.

APA, 6th edition

Umozritelʹnyi︠a︡ izsli︠e︡dovanīi︠a︡ Imperatorskoĭ Sanktpeterburgskoĭ akademīi nauk 1815 / t.4. (1808). [Periodicals]. Pri Imperatorskoĭ akademīi nauk. https://collections.library.yale.edu/catalog/30665415.