Chandler 1999. Fossil birds of Florissant, Colorado: with a description of a new genus and species of cuckoo. Santucci, Vincent L.; McClelland, Lindsay[Eds]. National Park Service Paleontological Research Volume 4. [Geological Resources Division Technical Report NPS/NRGRD/GRDTR-99/03.], US National Park Service, Geological Resources Division, Lakewood, 1999: i-viii, 1-126. Chapter pagination: 49-53