Ketprom, J., Rasrikreangkai, I., Poommai, S. and Dampin, N. 2020. Development Guidelines of Interpretive Signs for Self-Guided Mangrove Nature Trails: A Case Study of The King’s Royally Initiated Laem Phak Bia Environmental Research and Development Project. Humanities and Social Sciences Nakhonsawan Rajabhat University Academic Journal. 7, 1 (Oct. 2020), 201–207.