Zulfauzan, Z., R. Syahni Z, and M. Mahdi. “Impact of Government Policy on Advantages and Competitiveness of Corn (Case Study in Tigo Nagari District, Pasaman District West Sumatera Province)”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 42, no. 2, Oct. 2018, pp. 200-11, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/9454.