Oyen, 2007. Record from PROTA4U, van der Vossen, H. A. M., Mkamilo, G.S. (Editors), PROTA (Plant Resources of Tropical Africa/Ressources végétales de l’Afrique tropicale), Wageningen, Netherlands

Oyen, L. P. A., 2007. Crambe hispanica L.. Record from PROTA4U, van der Vossen, H. A. M., Mkamilo, G.S. (Editors), PROTA (Plant Resources of Tropical Africa/Ressources végétales de l’Afrique tropicale), Wageningen, Netherlands