[Autograph letter 1915 August to Isabel Lachaise]
MLA
Lachaise, Gaston, 1882-1935. [Autograph letter 1915 August to Isabel Lachaise]. Letters to Isabel Lachaise [1915 Aug-Oct]. [1915 August]. https://collections.library.yale.edu/catalog/2054065.
APA, 6th edition
Lachaise, Gaston, 1882-1935. (["Letters to Isabel Lachaise [1915 Aug-Oct]"])([1915 August])[[Autograph letter 1915 August to Isabel Lachaise]]. https://collections.library.yale.edu/catalog/2054065.