Cite

Ivory-billed woodpecker. Male 1.F. 2 and 3. Picus principalis. pl. 66 no. 14

MLA

Havell, Robert, 1793-1878. Ivory-billed woodpecker. Male 1.F. 2 and 3. Picus principalis. pl. 66 no. 14. v. 1. 1829. https://collections.library.yale.edu/catalog/2014415.

APA, 6th edition

Havell, Robert, 1793-1878. (["v. 1"])(1829)[Ivory-billed woodpecker. Male 1.F. 2 and 3. Picus principalis. pl. 66 no. 14]. https://collections.library.yale.edu/catalog/2014415.