For Geranium
Aedo, C. 2012. Revision of Geranium (Geraniaceae) in the New World. Syst. Bot. Monographs 95: 1-550.
Aedo, C. 2017. Taxonomic Revision of Geranium Sect. Ruberta and Unguiculata (Geraniaceae). Annals Mo. Bot. Garden 102: 409-465.
Aedo, C., J.J. Aldasoro, and C. Navarro. 1998. Taxonomic revision of Geranium sections Batrachioidea and Divaricata (Geraniaceae). Ann. Missouri Bot. Gard. 85: 594-630.
Albers & Van der Walt. 2007. In Kubitzki, K., C. Bayer, and P.F. Stevens, eds. 2007. The families and genera of vascular plants. IX. Flowering plants – Eudicots – Berberidopsidales, Buxales, Crossosomatales, Fabales p.p., Geraniales, Gunnerales, Myrtales p.p., Proteales, Saxifragales, Vitales, Zygophyllales, Clusiaceae alliance, Passifloraceae alliance, Dilleniaceae, Huaceae, Picramniaceae, Sabiaceae. Springer, Berlin. 509 pp.
Yeo, P.F. 1984. Fruit-discharge type in Geranium (Geraniaceae): its use in classification and its evolutionary implications. J. Linn. Soc. Bot. 89: 1-36.
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