@BOOK {EHUI:1991b,
title = {Indices for measuring the sustainability and economic viability of farming systems: RCMP research monograph, No. 3},
author = {Ehui, S. K. and Spencer, D. },
series = {RCMP Research monograph, No. 3},
year = {1991},
publisher = {International Institute of Tropical Agriculture (IITA)},
address = {Ibadan, Nigeria},
note = {28p.},
}