Template:Ref-Caldwell1887
From Embryology
Caldwell WH. The Embryology of Monotremata and Marsupialia Part I. (1887) Phil. Trans. Roy. Soc 178 B.
Caldwell WH. The Embryology of Monotremata and Marsupialia Part I. (1887) Phil. Trans. Roy. Soc 178 B.