ใสเกื้อ อ. 2013. Isolation of Acidotolerant/Acidophilic Photosynthetic Bacteria from Peat Soils in Nakhon Si Thammarat Province and the Promoting of Biomass and 5-Aminolevulinic Acid Production by Plackett-Burman Technique. Progress in Applied Science and Technology. 3, 2 (Dec. 2013), 75–89.