MLA

Ling nan da xue (Guangzhou, China). Arbor Day. 57, folder 640. 1917-1931. https://collections.library.yale.edu/catalog/33585735.

APA, 6th edition

Ling nan da xue (Guangzhou, China). (["57, folder 640"])(1917-1931)[Arbor Day]. https://collections.library.yale.edu/catalog/33585735.