“Nutritive Value of Fermented Water Hyacinth (Eichornia crassipes) Leaf with Aspergillus niger in Tegal Duck” (2011) Animal Production: Indonesian Journal of Animal Production, 12(2). Available at: https://jap.fapet.unsoed.ac.id/index.php/JAP/article/view/1253 (Accessed: 29 October 2026).