Samaksamarn, T., Pawaputanon Na Mahasarakham, C. , Kantrong, N. , Kamtawee, S., Pannak, N., Suknim, C. and Chailertvanitkul, P. 2021. Cytotoxicity of Thai Propolis Crude Extracts on Human Periodontal ligament cell, In Vitro. Khon Kaen University Dental Journal. 24, 1 (Mar. 2021), 52–65.