Royal Botanic Gardens, Kew
Ceratotropis, Legumes of the World, Nodulation, Rupert Barneby Award 2004, Legume researchers, Advances in Legume Systematics Part 11, Fabaceae, Legumes of South Asia, Fourth International Legume Conference 2001, Legumes, Leguminosae, Legume systematics, Nitrogen fixation, Vigna, Legume fruits and seeds, South American Legume Report, IGSM (International Group for the Study of Mimosoideae), ILDIS (International Legume Database and Information Service), Karren Redden, and Advances in Legume Systematics Part 10