Skull of <i>Ankylosaurus</i>, an armoured ornithischian dinosaur of the late Cretaceous of North America. This specimen (AMNH 5214) is from the Edmonton formation of Alberta.
<bdi><a href="https://en.wikipedia.org/wiki/en:William_Diller_Matthew" class="extiw" title="w:en:William Diller Matthew"><span title="American paleontologist">William Diller Matthew</span></a>
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1915
<p><i>Dinosaurs - With Special Reference to the American Museum Collections</i>. American Museum of Natural History, New York. 
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Online Ressource: <a rel="nofollow" class="external autonumber" href="https://www.biodiversitylibrary.org/item/182211#page/109/mode/1up">[1]</a>