Cite

"It is only a dog."

MLA

Hansen, Bert, 1944-. "It is only a dog.". Box 1, folder 8. 1894 June 7. https://collections.library.yale.edu/catalog/32325641.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 1, folder 8"])(1894 June 7)["It is only a dog."]. https://collections.library.yale.edu/catalog/32325641.