Cite

[Letter : 1999 August 30, Constance Porter to Mr. Morrison]

MLA

[Letter : 1999 August 30, Constance Porter to Mr. Morrison]. 1999. https://collections.library.yale.edu/catalog/11478007.

APA, 6th edition

[Letter : 1999 August 30, Constance Porter to Mr. Morrison]. (1999). [Correspondence]. https://collections.library.yale.edu/catalog/11478007.