MLA

Hixon, Lex (Alexander Paul, Jr.) (1941-1995). "Sufi material written by others, instruction for prayers and absolutions". box 9, folder 10. circa 1970s-1990s. https://collections.library.yale.edu/catalog/33579518.

APA, 6th edition

Hixon, Lex (Alexander Paul, Jr.) (1941-1995). (["box 9, folder 10"])(circa 1970s-1990s)["Sufi material written by others, instruction for prayers and absolutions"]. https://collections.library.yale.edu/catalog/33579518.