Williams, D.M.; Ebach, M.C. (2020). Classification, in: Williams, D.M. et al.Cladistics: a guide to biological classification. pp. 23-50. https://dx.doi.org/10.1017/9781139047678.005
In: Williams, D.M.; Ebach, M.C. (2020). Cladistics: a guide to biological classification. 3rd edition. Cambridge University Press: Cambridge. ISBN 9781107400412; e-ISBN 9781139047678. 452 pp. https://dx.doi.org/10.1017/9781139047678, meer
