(1992). Biological nitrogen fixation and sustainability of tropical agriculture: Proceedings of the fourth International Conference of the African Association for Biological Nitrogen Fixation (AABNF), held at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, 24 - 28 September 1990. Wiley.
Chicago-Zitierstil (17. Ausg.)Biological Nitrogen Fixation and Sustainability of Tropical Agriculture: Proceedings of the Fourth International Conference of the African Association for Biological Nitrogen Fixation (AABNF), Held at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, 24 - 28 September 1990. Chichester u. a: Wiley, 1992.
MLA-Zitierstil (9. Ausg.)Biological Nitrogen Fixation and Sustainability of Tropical Agriculture: Proceedings of the Fourth International Conference of the African Association for Biological Nitrogen Fixation (AABNF), Held at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, 24 - 28 September 1990. Wiley, 1992.