"Genetic assimilation: An esoteric or widespread mode of evolution?"
Freeman, G., and J. W. Lundelius. 1982. The developmental genetics of dextrality and sinistrality in the gastropod Lymnaea peregra . Wilhelm Roux's Archives of Developmental Biology 191: 69-83.
Govind, C. K. 1989. Asymmetry in lobster claws. American Scientist 77: 468-474. (a summary of some very nice experimetnal evidence that differential use triggers the transformation of a cutter into a crusher claw)
Hall, B.K. 1992. Evolutionary Developmental Biology . Chapman & Hall, 275 p. (see Chapter 9)
Jablonka, E., & M.J. Lamb. 1995. Epigenetic Inheritance and Evolution: The Lamarckian Dimension. Oxford, 346 p. (epigenetics is still alive & well!)
Simpson, G. G. 1953. The Baldwin effect. Evolution 7: 110-117. (a VERY nice history of ideas regarding the Baldwin effect, before it was called 'genetic assimilation' by Waddington)
Travis, J. 1994. Evaluating the adaptive role of morphological plasticity. Pp. 99-122 in Ecological Morphology. Integrative Organismal Biology, P. C. Wainwright and S. M. Reilly, eds. Univ. Chicago Press, Chicago. (perhaps the best review paper on adaptive phenotypic plasticity)
Via, S., R. Gomulkiewicz, G. d. Jong, S. M. Scheiner, C. D. Schlichting, and P. H. v. Tienderen. 1995. Adaptive phenotypic plasticity: Consensus and controversy. Trends in Ecology and Evolution 10: 212-217. (a nice overview of issues relating to the evolution of phenotypic plasticity)
Waddington, C. H. 1953a. Genetic assimilation of an acquired character. Evolution 7: 118-126. (experimental evidence for genetic assimilation)
Waddington, C. H. 1953b. The "Baldwin" effect, "genetic assimilation", and "homeostasis". Evolution 7: 386-387 (a reply to/comment on Simpson 1953)
Waddington, C. H. 1956. Genetic assimilation of the bithorax phenotype. Evolution 10: 1-13. (experimental evidence for genetic assimilation)