MLA

Jeleński, Konstanty A. (Konstanty Aleksander), 1922-1987. Printed material on Gombrowicz (Series II). Box 18, folder 381-387. circa 1964-1986. https://collections.library.yale.edu/catalog/2007804.

APA, 6th edition

Jeleński, Konstanty A. (Konstanty Aleksander), 1922-1987. (["Box 18, folder 381-387"])(circa 1964-1986)[Printed material on Gombrowicz (Series II)]. https://collections.library.yale.edu/catalog/2007804.