Template:Ref-Johnson1917
From Embryology
Johnson FP. A human embryo of twenty-four pairs of somites. (1917) Carnegie Instn. Wash. Publ., Contrib. Embryol., 21: 125-168.
Johnson FP. A human embryo of twenty-four pairs of somites. (1917) Carnegie Instn. Wash. Publ., Contrib. Embryol., 21: 125-168.