<i>Heliodoxa xanthogonys</i>
<bdi><a href="https://en.wikipedia.org/wiki/en:John_Gould" class="extiw" title="w:en:John Gould"><span title="English ornithologist (1804–1881)">John Gould</span></a>
</bdi>
Gould, John: <a href="//commons.wikimedia.org/wiki/Category:A_Monograph_of_the_Trochilidae" title="Category:A Monograph of the Trochilidae">A monograph of the Trochilidae, or family of humming-birds</a> (1880) <a rel="nofollow" class="external autonumber" href="https://archive.org/stream/monographTrochiSupplementGoul#page/n79/mode/2up">[1]</a>