Iyai, D.A., Sagrim, M., Pakage, S. and Murwanto, A.G. 2020. The Roles of Additive Effect between Swine Keeping Systems and Agro-Ecological Zones in Production and Socioeconomic Traits. Jurnal Sain Peternakan Indonesia. 15, 3 (Sep. 2020), 242–250.