These recommendations come from the MLA's "container" concepts. A more detailed description of "containers" and practice developing citations using this concept is available on the MLA's "Works Cited: A Quick Guide" available here: https://style.mla.org/works-cited/works-cited-a-quick-guide/. Samples of trickier sources may be available on the MLA's blog, "Ask the MLA" available here: https://style.mla.org/sections/ask-the-mla/
Instructions on citing sources from archives and special collections are available here: https://style.mla.org/citing-materials-physical-archives/.
Example 1: Author (last name, first name). Title/description of material. Date of creation (year month day). Collection name. Name of Repository, (Institutional affiliation,) Location. Call number, identifier or box/folder/item number. (URL if material accessed via digital collection).
Example 2: Format/Genre-appropriate Citation. Collection name. Name of Repository, (Institutional affiliation,) Location. (URL if material accessed via digital collection).
