Template:Brouillet et al., 2004
- Brouillet, L., Urbatsch, L. & Roberts, R.P. 2004. Tonestus kingii and T. aberrans are related to Eurybia and the Machaerantherinae (Asteraceae: Astereae) based on nrDNA (ITS and ETS) data: reinstatement of Herrickia and a new genus, Triniteurybia. SIDA, Contributions to Botany 21(2): 889-900. JSTOR BHL