BioStor
 | Fragmente zur Mykologie (XIII. Mitteilung, Nr. 642 bis 718) (1911) Sitzungsber. K. Akad. Wiss., Math.-Naturwiss. Kl. 120: 379-484 |
 | A synopsis of the genus Herrania R E Schultes (1958) Journal of the Arnold Arboretum 39: 217-295 |
 | Synopsis of the Genera and Suprageneric Taxa of Euphorbiaceae Grady L Webster (1994) Annals of the Missouri Botanical Garden 81: 33-144 |