MLA

Blake, William, 1757-1827. America, a prophecy. 1793 [i.e. 1794?]. https://collections.library.yale.edu/catalog/2002700.

APA, 6th edition

Blake, William, 1757-1827. (1793 [i.e. 1794?])[America, a prophecy]. https://collections.library.yale.edu/catalog/2002700.