MLA

Dougal, William H., 1822-1895, engraver, Drayton, Joseph. Zoophytes. 1849. https://collections.library.yale.edu/catalog/2042716.

APA, 6th edition

Dougal, William H., 1822-1895, engraver, & Drayton, Joseph. (1849)[Zoophytes]. https://collections.library.yale.edu/catalog/2042716.