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2. BPS Southeast Sulawesi. “Horticultural Crops Production Statistics in Southeast Sulawesi.” (2018). https://sultra.bps.go.id/publication.html?Publikasi%5BtahunJudul%5D=2018&Publikasi%5BkataKunci%5D=S tatistik+Produksi+Tanaman+Hortikultura+di+Sulawesi+Tenggara+2018&Publikasi%5BcekJudul%5D=0&yt0= Tampilkan.
3. BPS Muna Regency, Muna In Numbers. Muna Regency. (2018). https://munakab.bps.go.id/publication/2018/08/16/9e09b0ebd7463b6badd26549/kabupaten-muna-dalam-angka-2018.html.
4. Subandi, M. S., & Widjono, A., Jagung. Pusat Penelitian dan Pengembangan Tanaman Pangan, Bogor, 423. (1988)
5. Heady E.O and J.L. Dillon, “Agricultural Production Function.” (Lowa State University Press, Lowa. 1972).