@BOOK {COUPER:1994a,
title = {La construction et l'entretien des routes dans les stations experimentales: Guide de recherche de I'iita No. 20},
author = {Couper, D. C. },
series = {Guide de recherche de I'iita No. 20},
year = {1994},
month = {March},
publisher = {International Institute of Tropical Agriculture (IITA)},
address = {Ibadan, Nigeria},
note = {19p.},
}