Engelin Manopo, M., Khaddafi, M. ., & Indrayani, I. (2022). OPTIMIZATION OF MANPOWER IN SEAMLESS PIPE THREADING MANUFACTURE BATAM. International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET), 1(4), 199–206. https://doi.org/10.54443/ijset.v1i4.22