Figueiredo Estrela (December 1994), "Diversity and endemism of angiosperms in the Gulf of Guinea islands", Biodiversity and Conservation, 3 (9): 785–793, doi:10.1007/BF00129658, ISSN1572-9710
Figueiredo Estrela (December 1994), "Diversity and endemism of angiosperms in the Gulf of Guinea islands", Biodiversity and Conservation, 3 (9): 785–793, doi:10.1007/BF00129658, ISSN1572-9710