@INBOOK {MORTIMORE:1997,
title = {Cowpea in traditional cropping systems},
author = {Mortimore, M. J. and Singh, B. and Harris, F. and Blade, S. },
year = {1997},
type = {Advances in cowpea research},
pages = {99--113},
chapter = {9},
publisher = {International Institute of Tropical Agriculture (IITA); Japan International Research Center for Agricultural Sciences (JIRCAS)},
address = {Ibadan, Nigeria},
}