A. Trisna, N. Nuraini, Y. Rizal, and M. Mirzah, “The Effect of Substrate Composition Fermented Using Pleurotus ostreatus on the Nutrient Content of Palm Oil Sludge”, Int. J. Poult. Sci., vol. 18, no. 7, pp. 323–327, Jun. 2019, doi: 10.3923/ijps.2019.323.327.