MLA

Gombrowicz, Witold, 1904-1969. Compagnie Bernard Fontaine. bsd, folder 2121. [1967] Dec. https://collections.library.yale.edu/catalog/2008893.

APA, 6th edition

Gombrowicz, Witold, 1904-1969. (["bsd, folder 2121"])([1967] Dec)[Compagnie Bernard Fontaine]. https://collections.library.yale.edu/catalog/2008893.