1. (1988) A phylogenetic analysis of the Primates. In: The Phylogeny and Classification of the Tetrapods, Vol. 2: Mammals. ed. Clarendon Press, Oxford, pp. 143-175.
2. (1977) Foundations and methods of evolutionary classification. In: Major Patterns in Vertebrate Evolution. and eds. Plenum Press, New York, pp. 851-895.
3. and (1990) Perspectives from amino acid and nucleotide sequences on cladistic relationships among higher taxa of Eutheria. In: Current Mammalogy. ed. Plenum Press, New York, Vol. 2, pp. 545-572.
4. (1933) Plazentarbildung. In: Handbuch der vergleichenden Anatomie der Wirbeltiere. and eds. Urban and Schwarzenberg, Berlin, Vol. 6, pp. 155-234.