Lee, Dae H., et al. “Evaluation of Operator Visibility in Three Different Cabins Type Far-East Combine Harvesters”. International Journal of Agricultural and Biological Engineering, vol. 9, no. 4, July 2016, pp. 33-44, https://www.ijabe.migration.pkpps06.publicknowledgeproject.org/index.php/ijabe/article/view/1850.