Om, Namgay, Kuenzang Gyeltshen, and Ugyen Lama. 2015. “Determination of Soil Type and Optimal Moisture Content for Soil Used for Rammed Earth Construction in Bhutan”. Zorig Melong | A Technical Journal of Science, Engineering and Technology 2 (1): 7-10. http://103.133.216.217/index.php/zm/article/view/82.