Ningsih, Kursiah Warti, Dwi Sapta, and Rudi Fernando. 2016. “Occurrence of Low Back Pain in The Mechanical Part UPT Mechanization in Crops And Horticulture Department of Riau Province”. Jurnal Kesehatan Komunitas (Journal of Community Health) 3 (2):73-78. https://doi.org/10.25311/keskom.Vol3.Iss2.106.