Pradipta, Gerardine Widyaswari, et al. “Analysis of Factors Influencing The Performance of Plantation Workers in The Tlogo Plantation Semarang Regency”. Jurnal Ilmiah Econosains, vol. 16, no. 1, Apr. 2018, pp. 23-34, doi:10.21009/econosains.0161.03.