D. G. I. Harya, SP., M.Agr, P. D. I. T. Soedarto, M.P., and P. D. I. H. Hendrarini, M.Si, Standar Mutu dan Sertifikasi Produk Ekspor Komoditas Perkebunan. PT. Ghani Press Group, 2026. Accessed: Jul. 22, 2026. [Online]. Available: https://e-book.ghanipress.com/index.php/ghanipress/catalog/book/55