MLA

Guthrie, A. B., Jr. (Alfred Bertram), 1901-1991. Manuscript, n.d., typescript of poems used in the volume, typescript photocopy with annotations. Box 31, folder 402. undated. https://collections.library.yale.edu/catalog/17212551.

APA, 6th edition

Guthrie, A. B., Jr. (Alfred Bertram), 1901-1991. (["Box 31, folder 402"])(undated)[Manuscript, n.d., typescript of poems used in the volume, typescript photocopy with annotations]. https://collections.library.yale.edu/catalog/17212551.