MLA

Gallup, Donald, 1913-2000. "Conversations with Georgia O'Keeffe, Ghost Ranch and Abiquiu, New Mexico, 1965-1983, as recorded by Donald Gallup". Box 9. 1988 March 24. https://collections.library.yale.edu/catalog/17359525.

APA, 6th edition

Gallup, Donald, 1913-2000. (["Box 9"])(1988 March 24)["Conversations with Georgia O'Keeffe, Ghost Ranch and Abiquiu, New Mexico, 1965-1983, as recorded by Donald Gallup"]. https://collections.library.yale.edu/catalog/17359525.