Template:Ref-Keibel1900
From Embryology
Keibel F. and Abraham K. Normal plates of the development of vertebrates (Normentafeln zur Entwicklungsgeschichte der Wirbelthiere) Vol. 2. Normal Plates of the Development of the Chicken Embryo. (2. Heft Normentafeln zur Entwicklungsgeschichte Gallus domesticus) (1900) Fisher, Jena., Germany.