Herlambang, Admaja Dwi, et al. “The Flipped-Classroom Instructional Procedure Development and Its Implementation Effectiveness in Improving Procedural Knowledge Learning Outcomes at Vocational High Schools”. Elinvo (Electronics, Informatics, and Vocational Education), vol. 8, no. 2, Jan. 2024, pp. 201-13, doi:10.21831/elinvo.v8i2.57845.