Alvarenga, Herculano M. F.; Höfling, Elizabeth. Systematic Revision of the Phorusrhacidae (Aves: Ralliformes). Papéis Avulsos de Zoologia. 2003, 43 (4): 55–91. ISSN 0031-1049. doi:10.1590/S0031-10492003000400001.
Jones, W.; Rinderknecht, A.; Alvarenga, H.; Montenegro, F.; Ubilla, M. The last terror birds (Aves, Phorusrhacidae): new evidence from the late Pleistocene of Uruguay. Paläontologische Zeitschrift. 2017, 92 (2): 365–372. S2CID 134344096. doi:10.1007/s12542-017-0388-y. Note: their date of 96 thousand years BP is the maximum age, obtained from the bottom of the fossil-containing stratum.
Jones, W.; Rinderknecht, A.; Alvarenga, H.; Montenegro, F.; Ubilla, M. The last terror birds (Aves, Phorusrhacidae): new evidence from the late Pleistocene of Uruguay. Paläontologische Zeitschrift. 2017, 92 (2): 365–372. S2CID 134344096. doi:10.1007/s12542-017-0388-y. Note: their date of 96 thousand years BP is the maximum age, obtained from the bottom of the fossil-containing stratum.