Harya, G. I. ., Sudiyarto, G. S. . Budiwitjaksono, and M. . Patiung. “Competitiveness and Processing of Processed Cocoa Industry in Improving the Welfare of People’s Cocoa Farmers in East Java”. Nusantara Science and Technology Proceedings, May 2020, pp. 302-10, doi:10.11594/nstp.2019.0443.