Bochenski, Zygmunt; Bochenski, Zbigniew (19 December 2007). "An Old World hummingbird from the Oligocene: a new fossil from Polish Carpathians". Journal of Ornithology. 149 (2): 211–216. doi:10.1007/s10336-007-0261-y. S2CID22193761.
Louchart, Antoine; Tourment, Nicolas; Carrier, Julie; Roux, Thierry (27 September 2007). "Hummingbird with modern feathering: an exceptionally well-preserved Oligocene fossil from southern France". Naturwissenschaften. 95 (2): 171–175. doi:10.1007/s00114-007-0309-0. PMID17898977. S2CID24147647.
Mayr, Gerald (25 July 2006). "New specimens of the early Oligocene Old World hummingbird Eurotrochilus inexpectatus". Journal of Ornithology. 148 (1): 105–111. doi:10.1007/s10336-006-0108-y. S2CID11821178.
Mayr, Gerald (8 September 2009). "New specimens of the avian taxa Eurotrochilus (Trochilidae) and Palaeotodus (Todidae) from the early Oligocene of Germany". Paläontologische Zeitschrift. 84 (3): 387–395. doi:10.1007/s12542-009-0047-z. S2CID85106724.
Maxwell, Erin E. (1 December 2016). "The Rauenberg fossil Lagerstätte (Baden-Württemberg, Germany): A window into early Oligocene marine and coastal ecosystems of Central Europe". Palaeogeography, Palaeoclimatology, Palaeoecology. 463: 238–260. Bibcode:2016PPP...463..238M. doi:10.1016/j.palaeo.2016.10.002.
Maxwell, Erin E. (1 December 2016). "The Rauenberg fossil Lagerstätte (Baden-Württemberg, Germany): A window into early Oligocene marine and coastal ecosystems of Central Europe". Palaeogeography, Palaeoclimatology, Palaeoecology. 463: 238–260. Bibcode:2016PPP...463..238M. doi:10.1016/j.palaeo.2016.10.002.
Bochenski, Zygmunt; Bochenski, Zbigniew (19 December 2007). "An Old World hummingbird from the Oligocene: a new fossil from Polish Carpathians". Journal of Ornithology. 149 (2): 211–216. doi:10.1007/s10336-007-0261-y. S2CID22193761.
Louchart, Antoine; Tourment, Nicolas; Carrier, Julie; Roux, Thierry (27 September 2007). "Hummingbird with modern feathering: an exceptionally well-preserved Oligocene fossil from southern France". Naturwissenschaften. 95 (2): 171–175. doi:10.1007/s00114-007-0309-0. PMID17898977. S2CID24147647.
Mayr, Gerald (25 July 2006). "New specimens of the early Oligocene Old World hummingbird Eurotrochilus inexpectatus". Journal of Ornithology. 148 (1): 105–111. doi:10.1007/s10336-006-0108-y. S2CID11821178.
Mayr, Gerald (8 September 2009). "New specimens of the avian taxa Eurotrochilus (Trochilidae) and Palaeotodus (Todidae) from the early Oligocene of Germany". Paläontologische Zeitschrift. 84 (3): 387–395. doi:10.1007/s12542-009-0047-z. S2CID85106724.