MLA

Audubon, John James, 1785-1851. 3 Red-throated loon [Red-throated diver] Gaviiformes Gaviidae Gavia stellata. https://collections.library.yale.edu/catalog/9998248.

APA, 6th edition

Audubon, John James, 1785-1851. [3 Red-throated loon [Red-throated diver] Gaviiformes Gaviidae Gavia stellata]. https://collections.library.yale.edu/catalog/9998248.