Hossain, M Abul, et al. “Primary Productivity Estimation in Relation to Trophic Status in Altadighi in Naogaon District, Bangladesh”. University Journal of Zoology, Rajshahi University, vol. 22, June 2007, pp. 41-45, https://www.banglajol.info/index.php/UJZRU/article/view/88.