MLA

Say, Thomas, 1787-1834. American entomology, or Descriptions of the insects of North America. Illustrated by coloured figures from original drawings executed from nature. By Thomas Say .... 1824-28.. https://collections.library.yale.edu/catalog/10778720.

APA, 6th edition

Say, Thomas, 1787-1834. (1824-28.)[American entomology, or Descriptions of the insects of North America. Illustrated by coloured figures from original drawings executed from nature. By Thomas Say ...]. https://collections.library.yale.edu/catalog/10778720.