Brinaldi, A., and W. Purwanto. “Rancang Bangun Alat Uji Tekanan Pegas Katup Toyota Kijang 7K Berbasis Microcontroler”. AEEJ : Journal of Automotive Engineering and Vocational Education, Vol. 1, no. 2, Dec. 2020, pp. 85-92, doi:https://doi.org/10.24036/aeej.v1i2.30.