"Chefoo--China"
MLA
Wilder, Thornton, 1897-1975. "Chefoo--China". Box 131, folder 3030. n.d.. https://collections.library.yale.edu/catalog/17056686.
APA, 6th edition
Wilder, Thornton, 1897-1975. (["Box 131, folder 3030"])(n.d.)["Chefoo--China"]. https://collections.library.yale.edu/catalog/17056686.