Sugian, Ahmad, et al. “STUDI EFEKTIVITAS ALAT BERAT I-CONSTRUCTION DALAM PENINGKATAN PRODUKTIVITAS PEKERJAAN TANAH DI TAKANERIKI, JEPANG: Study of I-Construction Heavy Equipment Effectiveness on Productivity for the Land Clearing Project in Takaneriki, Japan”. Spektrum Sipil, vol. 12, no. 2, Oct. 2025, pp. 87-99, doi:10.29303/spektrum.v12i2.409.