@BOOK {CARTER:1989a,
title = {Collaborative Study of Cassava in Africa (COSCA); site selection procedure: COSCA working paper, No. 2},
author = {Carter, S. and Jones, P. },
series = {COSCA working paper},
year = {1989},
number = {2},
publisher = {International Institute of Tropical Agriculture (IITA)},
address = {Ibadan, Nigeria},
note = {RTB; Root and Tuber; Cassava},
}