Yusriana, Y., Y. Arkeman, S. Raharja, and P. Hariyadi. “The Model to Prove the Authenticity of Cocoa Beans Based on Intelligent System”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 24, no. 1, Aug. 2015, pp. 95-104, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/4385.