@INBOOK {WATANABE:1997d,
title = {Evaluation methods for drought tolerance of cowpeas},
author = {Watanabe, I. and Hakoyama, S. and Terao, T. and Singh, B. },
editor = {Singh, B. and Mohan-Raj, D. R. and Dashiell, K. and Jackai, L. },
year = {1997},
type = {Advances in cowpea research},
pages = {141--146},
publisher = {International Institute of Tropical Agriculture (IITA), Japan International Research Center for Agricultural Sciences (JIRCAS)},
address = {IITA, Ibadan, Nigeria},
}