MLA

Wheatley, Phillis, 1753-1784. Poems on various subjects, religious and moral / by Phillis Wheatley, Negro servant to Mr. John Wheatley, of Boston, in New England.. MDCCLXXIII [1773]. https://collections.library.yale.edu/catalog/11687073.

APA, 6th edition

Wheatley, Phillis, 1753-1784. (MDCCLXXIII [1773])[Poems on various subjects, religious and moral / by Phillis Wheatley, Negro servant to Mr. John Wheatley, of Boston, in New England.]. https://collections.library.yale.edu/catalog/11687073.