Christenhusz, M.J.M. og J.W. Byng (2016). «The number of known plants species in the world and its annual increase». Phytotaxa. 261 (3): 201–217. ISSN1179-3163. doi:10.11646/phytotaxa.261.3.1.
uu.nl
www-binf.bio.uu.nl
Nature – Francesca D. Ciccarelli, Tobias Doerks, Christian von Mering, Christopher J. Creevey, Berend Snel,Peer Bork: «Toward Automatic Reconstruction of a Highly Resolved Tree of Life», Nature Nr 311, 2006. De kaller arkebakterier for en fyle («Phylum»).
Nature – Francesca D. Ciccarelli, Tobias Doerks, Christian von Mering, Christopher J. Creevey, Berend Snel,Peer Bork: «Toward Automatic Reconstruction of a Highly Resolved Tree of Life», Nature Nr 311, 2006.
worldcat.org
Christenhusz, M.J.M. og J.W. Byng (2016). «The number of known plants species in the world and its annual increase». Phytotaxa. 261 (3): 201–217. ISSN1179-3163. doi:10.11646/phytotaxa.261.3.1.