Hartmann, H. E. K. 2017: Titanopsis - Ruschioideae. – In: Hartmann, H. E. K., Illustrated handbook of succulent plants. Aizoaceae, ed. 2. – Berlin: Springer

Title	Titanopsis - Ruschioideae
Authorship	Hartmann, H. E. K.
In book	Hartmann, H. E. K. 2017: Illustrated handbook of succulent plants. Aizoaceae, ed. 2. – Berlin: Springer