MLA

Wilkins, John, 1614-1672. An essay towards a real character : and a philosophical language / by John Wilkins .... 1668. https://collections.library.yale.edu/catalog/10885195.

APA, 6th edition

Wilkins, John, 1614-1672. (1668)[An essay towards a real character : and a philosophical language / by John Wilkins ...]. https://collections.library.yale.edu/catalog/10885195.