1. Assheton, Studies in the development of the rabbit and the frock. Quart. J. microsc. Sci.1895
2. Assheton, The morphology of the ungulate Placenta. Phil. trans. roy. Soc., S. B198 (1906)
3. Assheton, On the foetus and placenta of the Spiny-mouse. Proc. roy. Soc. Lond.2 (1905).
4. Dodds, The area of the chorionic villi in the fullterm placenta. Anat. Rec.24, 287–293 (1923).
5. Grosser, Frühentwicklung, Eihautbildung und Placentation. München: Bergmann 1927 (hier weitere Literatur)