Singharat, Kanchai, Sirirat Sangkarak, Onuma Pongsuk, and Suwannee Junyapoon*. 2018. “Biogas Production from Bakery Wastewater in Two-Stage Anaerobic Digestion System”. CURRENT APPLIED SCIENCE AND TECHNOLOGY 17 (1). Bangkok, Thailand:103-12. https://li01.tci-thaijo.org/index.php/cast/article/view/129465.