@BOOK {KANG:1997a,
title = {Les engrais; definitions et calculs: Guide de recherche de l'Iita, No. 24},
author = {Kang, B. T. },
series = {Guide de recherche de l'Iita, No. 24},
year = {1997},
month = {January},
publisher = {International Institute of Tropical Agriculture (IITA)},
address = {Ibadan, Nigeria},
note = {28p.},
}