Dwipa, Indra, et al. “Effect of Indigenous Rhizobacteria and Manure on the Growth and Yield of Red Potato (Solanum Tuberosum L.) in Solok, West Sumatera”. International Journal on Advanced Science, Engineering and Information Technology, vol. 9, no. 4, Aug. 2019, pp. 1371-7, doi:10.18517/ijaseit.9.4.9385.