Template:Ref-AnsonCauldwell1943
From Embryology
Anson, B. J., and Cauldwell, E. W.: Stapes, Fissula Ante Fenestram and Associated Structures in Man: IV. From Fetuses 75 to 150 Mm. in Length , Arch. Otolaryng. 37:650-671 ( (May) ) 1943.