Herrera, W. T; Harwood, R. R, 'Crop interrelationships in intensive cropping systems', vol. 24 pages, Paper presented at the IRRI Saturday Seminar, July 21, 1973. 24 p, 1973
International Institute of Tropical Agriculture. (2017). Workshop on maize seed health and seed testing for pests and pathogens - assessment of selected detection methods. Ibadan, Nigeria: IITA Communication Unit
International Institute of Tropical Agriculture. (2011). Forging economic transformation: the role of agricultural research and productivity 02. Ibadan, Nigeria: IITA Communication Unit