Indiana University Press. ISBN 978-0-253-34282-9 ↑ Alvarenga, H.; Chiappe, L.; Bertelle, S. (2011-05-03), Phorusrhacids: the Terror Birds, in Dyke, G.; Kaiser, G., Living Dinosaurs: The Evolutionary History of Modern Birds, Wiley, pp. 187–208, ISBN 978-0-470-65666-2 ↑ Vergano, Dan (8 July 2014).