Sinurat, A., Purwadaria, T., Rosida, J., Surachman, H., Hamid, H., & Kompiang, P. (1998). The effect of fermentor temperatures and moisture content of substrate on the nutritive value of fermented palm oil sludge. Pusat Penelitian dan Pengembangan Peternakan.

Sinurat, A.P., T. Purwadaria, J. Rosida, H. Surachman, H. Hamid, و P. Kompiang. The Effect of Fermentor Temperatures and Moisture Content of Substrate On the Nutritive Value of Fermented Palm Oil Sludge. Pusat Penelitian dan Pengembangan Peternakan, 1998.

Sinurat, A.P., et al. The Effect of Fermentor Temperatures and Moisture Content of Substrate On the Nutritive Value of Fermented Palm Oil Sludge. Pusat Penelitian dan Pengembangan Peternakan, 1998.