1. Battista, L. (2009) Il genere Haworthia. Piante Grasse 29(Suppl.): 1–52, ills. map.
2. Bayer, M. B. (1976) Haworthia handbook. A guide to the species, with identification keys and illustrations. Kirstenbosch (ZA): National Botanic Gardens of South Africa.
3. Bayer, M. B. (1982) The new Haworthia handbook. A revised guide to the literature of the genus, with discussion of the species, identification keys and colour illustrations. Kirstenbosch (ZA): National Botanic Gardens of South Africa.
4. Bayer, M. B. (1999) Haworthia revisited. A revision of the genus. Hatfield (ZA): Umdaus Press.
5. Bayer, M. B. (2001) Haworthia rossouwii V.Poelln. and the demise of H. serrata Bayer. Aloe 38(1-2): 31–36, ills.