MLA

Beinecke, Edwin J. (Edwin John), 1886-1970. RLS Autobiographical Passages copied from notebooks, with notes relating to Balfour, signed "EJB 11/19/29". Box 74, folder 1816. 1929 November 19. https://collections.library.yale.edu/catalog/16609954.

APA, 6th edition

Beinecke, Edwin J. (Edwin John), 1886-1970. (["Box 74, folder 1816"])(1929 November 19)[RLS Autobiographical Passages copied from notebooks, with notes relating to Balfour, signed "EJB 11/19/29"]. https://collections.library.yale.edu/catalog/16609954.