• Viktor Hamburger—Adapted from D. Purves and J. W. Lichtman 1985. Principles of Neural Development. Sinauer Associates, Sunderland, MA.

  • Rita Levi-Montalcini—SAdapted from Purves, D. and Lichtman, J. W. 1985. Principles of Neural Development. Sinauer Associates, Sunderland, MA.