Hirayama, Isaji & Hibino 2013. Kappachelys okurai gen. et sp. nov., a new stem soft-shelled turtle from the Early Cretaceous of Japan. Morphology and evolution of turtles. Proceedings of the Gaffney Turtle Symposium (2009) in honor of Eugene S. Gaffney., Springer, Dordrecht, Heidelberg, etc., 2013: i-xix, 1-577. Chapter pagination: 179-185