Kasemsanti, V., S. Yooyen, S. Xhauchuvej, and N. Singhabootra. “A Study of the composition of Soil Extract Media for determining Total Bacterial Count of soil”. Agriculture and Natural Resources, vol. 7, no. 1, Jan. 1973, pp. 8-12, https://li01.tci-thaijo.org/index.php/anres/article/view/240646.