Adisusilo, A.K. et al. 2018. Designing Immersive Serious Game Based on Soil Tillage : Polynomial Model for Horizontal Plowing Force Model. International Journal of Engineering & Technology. 7, 4.28 (Nov. 2018), 404–410. DOI:https://doi.org/10.14419/ijet.v7i4.28.22621.