MLA

Brodsky, Joseph, 1940-1996. Brodskii, Aleksandr Ivanovich and Mariia Moiseevna Vol'pert-Brodskaia (Joseph Brodsky's parents). Box 154, folder 3447-3454. 1930s-1980s, undated. https://collections.library.yale.edu/catalog/9998353.

APA, 6th edition

Brodsky, Joseph, 1940-1996. (["Box 154, folder 3447-3454"])(1930s-1980s, undated)[Brodskii, Aleksandr Ivanovich and Mariia Moiseevna Vol'pert-Brodskaia (Joseph Brodsky's parents)]. https://collections.library.yale.edu/catalog/9998353.