[Autograph letter 1910 October to Isabel Lachaise]
MLA
Lachaise, Gaston, 1882-1935. [Autograph letter 1910 October to Isabel Lachaise]. Letters to Isabel Lachaise [1910-1912]. [1910 October]. https://collections.library.yale.edu/catalog/2054059.
APA, 6th edition
Lachaise, Gaston, 1882-1935. (["Letters to Isabel Lachaise [1910-1912]"])([1910 October])[[Autograph letter 1910 October to Isabel Lachaise]]. https://collections.library.yale.edu/catalog/2054059.