Phaechamud, Thawatchai, Juree Charoenteeraboon, Penpun Wetwitayaklung, Chutima Limmatvapirat, and Thaksin Srichan. 2013. “Some Biological Activities and Safety of Mineral Pitch”. Science, Engineering and Health Studies 2 (2):7-17. https://doi.org/10.14456/sustj.2008.6.