Simpson, J. Y. (1849). The Attitude and Positions, Natural and Preternatural, of the Fœtus in Utero, Acts of the Reflex or Excito-Motory System: Part II. Mon J Med Sci.

Simpson, J. Y. "The Attitude and Positions, Natural and Preternatural, of the Fœtus in Utero, Acts of the Reflex or Excito-Motory System: Part II." Mon J Med Sci 1849.

Simpson, J. Y. "The Attitude and Positions, Natural and Preternatural, of the Fœtus in Utero, Acts of the Reflex or Excito-Motory System: Part II." Mon J Med Sci 1849.