Robot, Marsel B., et al. “TREN RETURN ON ASSET (ROA) PADA PT ASTRA AGRO LESTARI TBK PERIODE 2012 – 2016”. AGRI-SOSIOEKONOMI, vol. 13, no. 2, June 2017, pp. 11-18, doi:10.35791/agrsosek.13.2.2017.16341.