"America's Super Cities" (Harper's article)
MLA
Tunnard, Christopher, 1910-1979. "America's Super Cities" (Harper's article). Box 31, folder 478. 1958 August. https://collections.library.yale.edu/catalog/10014267.
APA, 6th edition
Tunnard, Christopher, 1910-1979. (["Box 31, folder 478"])(1958 August)["America's Super Cities" (Harper's article)]. https://collections.library.yale.edu/catalog/10014267.