Markus Lambertz, Steven F. Perry (2015): Chordate phylogeny and the meaning of categorial ranks in modern evolutionary biology. Proceedings of the Royal Society B 282, 1807. doi:10.1098/rspb.2014.2327
Gonzalo Giribet, Gustavo Hormiga, Gregory D. Edgecombe (2016): The meaning of categorical ranks in evolutionary biology. Organisms Diversity & Evolution 16(3): S. 613-639. doi:10.1007/s13127-016-0263-9
Aharon Oren, George M. Garrity: Valid publication of the names of forty-two phyla of prokaryotes. In: Int. J. of Systematic And Evolutionary Microbiology (IJSEM), Band 71, Nr. 10, 25. Oktober 2021; doi:10.1099/ijsem.0.005056: 42 offizielle Phyla an Archaeen und Bakterien ohne jegliche Cyanobakterienim weiteren Sinne.