Template:Ref-Lewis1920
From Embryology
Lewis WH. The cartilaginous skull of a human embryo twenty-one millimeters in length. (1920) Carnegie Instn. Wash. Publ. 272, Contrib. Embryo., 9: 299-324.
Lewis WH. The cartilaginous skull of a human embryo twenty-one millimeters in length. (1920) Carnegie Instn. Wash. Publ. 272, Contrib. Embryo., 9: 299-324.