MLA

Hovhaness, Alan, 1911-2000. "Some additional momentos" consisting of envelopes addressed to Malina in Hovhaness's hand. Box 1, folder 11. 1954-58. https://collections.library.yale.edu/catalog/17167338.

APA, 6th edition

Hovhaness, Alan, 1911-2000. (["Box 1, folder 11"])(1954-58)["Some additional momentos" consisting of envelopes addressed to Malina in Hovhaness's hand]. https://collections.library.yale.edu/catalog/17167338.