Template:Ref-Keibel1908
From Embryology
Keibel F. and Elze C. Normal plates of the development of vertebrates (Normentafeln zur Entwicklungsgeschichte der Wirbelthiere) Vol. 8. Normal Plates of the Development of the Human Embryo. (8. Heft Normentafeln zur Entwicklungsgeschichte des Menschen) (1908) Fisher, Jena., Germany.