@book{57731,
	author = {"Wessel, M."},
	title = {Fertilizer requirements of cacao(Theobroma cacao L.) in South Western Nigeria (Royal Trop.Inst. Dept.d of Agric. Res. Copmmunication No.61)},
	publisher = {Royal Tropical Inst.},
	year = {Amsterdam},
	address = {1971}
}