"The Clements Checklist of Birds of the World 6th Edition" by James F. Clements. 2007. [book review]
According to PR-model, "The Clements Checklist of Birds of the World 6th Edition" by James F. Clements. 2007. [book review] is ranked 714,530th in multilingual Wikipedia, in particular this website is ranked 21,031st in Portuguese Wikipedia.