Gaya APA
Uexkull, H, R, V. (1986).
Efficient fertilizer use in acid upland soils f the humid tropics .
Rome:
FAO and UNEP.
Gaya MLA
Uexkull, H., R., Von.
"Efficient fertilizer use in acid upland soils f the humid tropics".
Rome:
FAO and UNEP,
1986.
Text.