@INBOOK {SINGH:1997e, title = {Cowpea: An integral component of sustainable mixed crop/livestock farming systems in West Africa and strategies to improve its productivity}, author = {Singh, B. and Tarawali, S. }, editor = {Renard, C. }, year = {1997}, type = {Crop residues in sustainable mixed crop-livestock farming systems}, pages = {79--100}, publisher = {CAB International}, address = {Wallingford, Oxon, UK}, }