MLA

Hughes, Langston, 1902-1967--Musical settings, Thomas, Frances S., -1999, composer. No crystal stair : a setting of the poem "Mother to son" for voice and piano / words by Langston Hughes ; music by Frances Thomas.. [1957]. https://collections.library.yale.edu/catalog/17365265.

APA, 6th edition

Hughes, Langston, 1902-1967--Musical settings, & Thomas, Frances S., -1999, composer. ([1957])[No crystal stair : a setting of the poem "Mother to son" for voice and piano / words by Langston Hughes ; music by Frances Thomas.]. https://collections.library.yale.edu/catalog/17365265.