G. E. Gibbs Russell, ?Distribution of subfamilies and tribes of Poaceae in southern Africa?, Monographs of Systematic Botany of the Missouri Botanical Garden, vol. 65, pp. 555-566, 1988.

G. E. Gibbs Russell, ?Significance of different centres of diversity in subfamilies of Poaceae in Southern Africa?, Palaeoecology of Africa, vol. 17, pp. 183-191, 1986.

G. E. Gibbs Russell, ?Significance of different centres of diversity in subfamilies of Poaceae in southern Africa?, Palaeoecology of Africa, vol. 17, pp. 183-191, 1987.