Nunkaew, Tomorn, Duangporn Kantachote, Teruhiko Nitoda, and Hiroshi Kanzaki. 2012. “The Use of Rice Straw Broth As an Appropriate Medium to Isolate Purple Nonsulfur Bacteria from Paddy Fields”. Electronic Journal of Biotechnology 15 (6). Valparaíso, Chile. https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/v15n6-9.