Goenner, C., S. Schwarz, . Budiono, D. Kreb, and A. Soeyitno. “Waterbird Population Dynamics in the Middle Mahakam Wetlands of East Kalimantan over 23 Years”. KUKILA, Vol. 17, no. 2, Mar. 2014, pp. 100-21, https://kukila.org/index.php/KKL/article/view/407.