Cite

Here on the sooty London height, draft, holograph

MLA

Betjeman, John, 1906-1984. Here on the sooty London height, draft, holograph. Box 3, folder 170. undated. https://collections.library.yale.edu/catalog/17306196.

APA, 6th edition

Betjeman, John, 1906-1984. (["Box 3, folder 170"])(undated)[Here on the sooty London height, draft, holograph]. https://collections.library.yale.edu/catalog/17306196.