@book{57729,
	author = {"De Waard, P.W.F."},
	title = {"Foliar diagnosis, mutrition and yield stability of black pepper (Piper Nigrum L.) in sarawak.(Royal Trop.Inst. Dept.d of Agric. Res. Copmmunication No.59)"},
	publisher = {Royal Tropical Inst.},
	year = {Amsterdam},
	address = {1969}
}