Template:Ref-Johnstone1914
From Embryology
Johnstone, R. W. 1914. Contribution to the study of the early human ovum based upon the investigation of I. A very early ovum embedded in the uterus and II. A very early ovum in the infundibulum of the tube. J. Obstet. Gynaec. Brit. Emp., 26, 231-276.
