Perlindungan Bagi Para Pihak Dalam Pelaksanaan Perjanjian Kerjasama Kemitraan Pola Inti Plasma (Studi PT. Charoen Pokphand Indonesia Dengan Mitra Peternak Ayam) = Legal Protection for Parties in the Implementation of Core-Plasma Partnership Agreements (Case Study of PT. Charoen Pokphand Indonesia with Poultry Farmers)