[Postcard: 1924 October 28, Châtelaillon: Konstantin Dmitrievich Balʹmont to D[agmar] Chahovskoy, Paris]
MLA
Balʹmont, Konstantin Dmitrievich, 1867-1942. [Postcard: 1924 October 28, Châtelaillon: Konstantin Dmitrievich Balʹmont to D[agmar] Chahovskoy, Paris]. Box 4. 1924 October 28. https://collections.library.yale.edu/catalog/10082168.
APA, 6th edition
Balʹmont, Konstantin Dmitrievich, 1867-1942. (["Box 4"])(1924 October 28)[[Postcard: 1924 October 28, Châtelaillon: Konstantin Dmitrievich Balʹmont to D[agmar] Chahovskoy, Paris]]. https://collections.library.yale.edu/catalog/10082168.