Hecht, M. K., and J. L. Edwards . 1977. The methodology of phylogenetic inference above the species level. In: Hecht, M. K., P. C. Goody, and B. M. Hecht (Ed.), Major Patterns of Vertebrate Evolution. NATO Advanced Study Institutes Series. Series A—Life Sciences. Volume 14. Plenum Press [New York and London], 3-52.