[Autograph letter 1930] August 21, New York, New York, [to Isabel Lachaise]
MLA
[Autograph Letter 1930] August 21, New York, New York, [to Isabel Lachaise]. 0AD. https://collections.library.yale.edu/catalog/2042568.
APA, 6th edition
[Autograph letter 1930] August 21, New York, New York, [to Isabel Lachaise]. (0 C.E.). [Correspondence, Drawings, Family papers, Illustrations]. https://collections.library.yale.edu/catalog/2042568.