1. Bernardi, N. (1981). Phylogenetic relationships, monophyletic group and related concepts. Revista Brasileira de Entomologia, 25(4), 323–326.
2. Farris, J. S. (1974). Formal definitions of paraphyly and polyphyly. Systematic Zoology, 23(4), 548–554.
3. Hennig, W. (1950). Grundzugeeiner Theorie der phylogenetischen Systematik. Berlin: Deutscher Zentralverlag.
4. Hennig, W. (1966). Phylogenetic systematics. Chicago: University of Illinois press.
5. Hennig, W. (1968). Elementos de una Sistemática Filogenética. Buenos Aires: EUDEBA.