Template:Ref-EvansBartelmez1917
From Embryology
Evans HM. and Bartelmez GW. A human embryo of seven to eight somites. (1917) Anat. Rec. 11: 355.
Evans HM. and Bartelmez GW. A human embryo of seven to eight somites. (1917) Anat. Rec. 11: 355.