Joubert, D.; Kent, J. 2014. Rhinos without borders: a project of hope for the rhinos of southern Africa. Johannesburg. pp. 1-9.
Novellie, P.; Hall-Martin, A.; Joubert, D. 1991. The problem of maintaining large herbivores in small conservation areas: deterioration of the grassveld in the Addo Elephant National Park. Koedoe 34 (1): 41-50, figs. 1-5, table 1.






