DIRETORAT ENDRAL PERKEBUNAN KEMENTRIAN PERTANIAN
POCKET GUIDE : OIL PALM SERIES MATURE VOLUME 6
POCKET GUIDE : OIL PALM SERIES IMMATURE VOLUME 5
SERI TANAMAN KELAPA SAWIT : TANAMAN MENGHASILKAN VOLUME 3
SERI TANAMAN KELAPA SAWIT : TANAMAN BELUM MENGHASILKAN VOLUME 2