Nasution, F. E., I. Suliansyah, and Z. Syarif. “Optimization of Planting Range and Seed Age Toward the Growth and Production Rice Paddy (Oryza Sativa L.)”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 42, no. 5, Dec. 2018, pp. 53-60, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/9505.