Gregory, Isabella Augusta Persse, lady, 1852-1932. 3 ALS and 1 post card, Coole Park
MLA
Drinkwater, John, 1882-1937. Gregory, Isabella Augusta Persse, lady, 1852-1932. 3 ALS and 1 post card, Coole Park. Box 4, folder 155. 1917-[18?], n.d.. https://collections.library.yale.edu/catalog/2036577.
APA, 6th edition
Drinkwater, John, 1882-1937. (["Box 4, folder 155"])(1917-[18?], n.d.)[Gregory, Isabella Augusta Persse, lady, 1852-1932. 3 ALS and 1 post card, Coole Park]. https://collections.library.yale.edu/catalog/2036577.