H. Suryani, M. Zain, N. Jamarun, and R. Ningrat, “Peran Direct Fed Microbials (DFM) Saccharomyces cerevisiae dan Aspergillus oryzae terhadap Produktivitas Ternak Ruminansia : Review”, JPI, vol. 17, no. 1, pp. 27–37, Feb. 2015.