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		Suarjana, I., 		Widia, I., & 		Darmawan, K.
2017 Jul  4.  Penentuan Nilai Kontrak Asuransi Usaha Tani Tanaman Kopi Arabika  Berbasis Indeks Harga Internasional. Jurnal BETA (Biosistem dan Teknik Pertanian). [Online] 5:2