@BOOK {RHOADES:1992,
title = {The art of the informal agricultural survey: IITA research guide, No. 36},
author = {Rhoades, R. E. },
series = {IITA research guide, No. 36},
year = {1992},
publisher = {International Institute of Tropical Agriculture (IITA)},
address = {Ibadan, Nigeria},
note = {57p.},
}