Suryanti, S., A. Umami, S. Gunawan, I. S. Santi, and R. H. Maulana. “Influence of PGPR, Bio-Phosphate Microorganism and Phosphate on Growth of Oil Palm Seedlings Under Drought Stress Conditions”. KnE Life Sciences, Vol. 7, no. 3, June 2022, pp. 427–434, doi:10.18502/kls.v7i3.11149.