John, D.M., Wynne, M.J. & Tsarenko, P.M. (2014)

Reinstatement of the genus Willea Schmidle 1900 for Crucigeniella Lemmermann 1900 nom. illeg. (Chlorellales, Trebouxiophyceae, Chlorophyta)

. Phytotaxa 167 (2): 212–214. https://doi.org/10.11646/phytotaxa.167.2.10