Miscellaneous personal materials.
MLA
Greg, W. W. (Walter Wilson), 1875-1959. Miscellaneous personal materials.. Box 7. 1900-1950. https://collections.library.yale.edu/catalog/2042227.
APA, 6th edition
Greg, W. W. (Walter Wilson), 1875-1959. (["Box 7"])(1900-1950)[Miscellaneous personal materials.]. https://collections.library.yale.edu/catalog/2042227.