Template:Ref-BartelmezEvans1926
From Embryology
Bartelmez GW. and Evans HM. Development of the human embryo during the period of somite formation, including embryos with 2 to 16 pairs of somites. (1926) Contrib. Embryol., Vol. 17, Carn. Inst. Wash. Pub. No. 85, pp. 1-67.