Selvia Nurliza, et al. “Analysis of the Added Value of Hard Candy With Robusta Green Coffee Bean Powder Extract”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 78, no. 1, Nov. 2025, pp. 314-22, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/17613.