MLA

Acton, Harold, 1904-1994. An T'ien Hui (Paradise Regained). Box 1, folder 37-38. 1933 1941. https://collections.library.yale.edu/catalog/17282065.

APA, 6th edition

Acton, Harold, 1904-1994. (["Box 1, folder 37-38"])(1933 1941)[An T'ien Hui (Paradise Regained)]. https://collections.library.yale.edu/catalog/17282065.