[1]
A. E. Salwa, S. Syahril, E. Indrawan, and G. K. Kassymova, “Problem-based learning in orthogonal projection drawing: A quasi-experimental study on vocational machining students’ technical drawing achievement”, JPTK, vol. 9, no. 2, pp. 146–160, May 2026, doi: 10.24036/jptk.v9i2.50323.