Judith Butcher (1992). Copy-editing (3 utg.). Cambridge, Storbritannia: Cambridge University Press. s. 319. ISBN0-521-40074-0.
doi.org
Robert M. Zink (2004). «The role of subspecies in obscuring avian biological diversity and misleading conservation policy». Proc. R. Soc. Lond. B. 271 (1539): 561–564. ISSN1471-2954. doi:10.1098/rspb.2003.2617.
G.M. Mace (2004). «The role of taxonomy in species conservation». Phil. Trans. R. Soc. Lond. B. 359 (1444): 711–719. ISSN1471-2970. doi:10.1098/rstb.2003.1454.
Robert M. Zink (2004). «The role of subspecies in obscuring avian biological diversity and misleading conservation policy». Proc. R. Soc. Lond. B. 271 (1539): 561–564. ISSN1471-2954. doi:10.1098/rspb.2003.2617.
G.M. Mace (2004). «The role of taxonomy in species conservation». Phil. Trans. R. Soc. Lond. B. 359 (1444): 711–719. ISSN1471-2970. doi:10.1098/rstb.2003.1454.