1. Veld Types of South Africa;Acocks,1988
2. Imperial Ecology: Environmental Order in the British Empire, 1895–1945;Anker,2001
3. Volume MR302: South Africa: National Botanic Garden 1910–1928, Pearson to Prain, 4 November 1910;Archives of the Royal Botanic Gardens, Kew, London,1910
4. Volume MR300: South Africa: Botanical Survey, 1917–1923;Archives of the Royal Botanic Gardens, Kew, London,1917
5. Volume MR301: South Africa: Division of Botany, Pretoria 1915–1928, Phillips to Prain 31 August 1919;Archives of the Royal Botanic Gardens, Kew, London,1919