Sifa, A., T. Endramawan, D. Suwandi, I. Farhan, and R. Maulana. “Design and Build Low-Cost Power Hammer Machine Based on Throttle Stomp”. INVOTEK: Jurnal Inovasi Vokasional Dan Teknologi, Vol. 22, no. 3, May 2023, pp. 179-86, doi:https://doi.org/10.24036/invotek.v22i3.1065.