• Duval, Mathias (1989) Atlas d'Embryologie. (116 pp., 40 plates). Paris.
  • Hamburger, Viktor (1938) Morphogenetic and axial self-differentiation of transplanted limb primordia of 2-day chick embryos. J. Exp. Zool., 77: 379399.
  • Hamburger, Viktor 1942 A Manual of Experimental Embryology. 213 pp. University of Chicago Press.
  • Kelbel, F., and K. Abraham 1900 Normentafel zur Entwicklungsgeschichte des Huhnes (Gallus domesticus). 132 pp. Jena.
  • Spratt, Nelson T., Jr. 1942 Location of organ-specific regions and their re-lationship to the development of the primitive streak in the early chick blastoderm. J. Exp. Zool., 89: 69101.
  • Nelson, T. Spratt, Jr. 1946 Formation of the primitive streak in the explanted chick blastoderm marked with carbon particles. J. Exp. Zool., 103: 259304.
  • Saunders John W., Jr. 1948 The proximo-distal sequence of origin of the parts of the chick wing and the role of the ectoderm. J. Exp. Zool., 108: 363403.