Pradiko, I., E. N. Ginting, N. H. Darlan, W. Winarna, and H. H. Siregar. “CORRELATION BETWEEN RAINFALL PATTERN AND OIL PALM PERFORMANCE IN SUMATRA AND BORNEO ISLAND DURING EL NIÑO 2015”. Jurnal Penelitian Kelapa Sawit, Vol. 24, no. 2, Aug. 2016, pp. 87-96, doi:10.22302/iopri.jur.jpks.v24i2.11.