Ōhashi Tomoyuki; Hasegawa Yoshikazu (2020). "New Species of Plotopteridae (Aves) from the Oligocene Ashiya Group of Northern Kyushu, Japan". Paleontological Research. 24 (4): 285–297. doi:10.2517/2020PR005. S2CID222136032.
Ōhashi Tomoyuki; Hasegawa Yoshikazu (2020). "New Species of Plotopteridae (Aves) from the Oligocene Ashiya Group of Northern Kyushu, Japan". Paleontological Research. 24 (4): 285–297. doi:10.2517/2020PR005. S2CID222136032.