Tobgay และ Kitichate Sridit. (2019) Distribution pattern, composition, and diversity of the Rubiaceae speciesalong the altitudinal gradient of the Himalayas in Western Bhutan. <i>Songklanakarin Journal of Science and Technology</i>, <i>41</i>(5), 1037-1047.Tobgay และ Kitichate Sridit. "Distribution pattern, composition, and diversity of the Rubiaceae speciesalong the altitudinal gradient of the Himalayas in Western Bhutan". Songklanakarin Journal of Science and Technology 41 (2019):1037-1047.Tobgay และ Kitichate Sridit. Distribution pattern, composition, and diversity of the Rubiaceae speciesalong the altitudinal gradient of the Himalayas in Western Bhutan. Research and Development Office, Prince of Songkla University:ม.ป.ท. 2019.