Zafrullah, Ersa Mayola, Rizki Tika Ayuni, and Cheequitha Adhelia. “Development of Instruments for Learning Independence for High School Students: Construct Validity and Reliability”. Beginner: Journal of Teaching and Education Management, vol. 1, no. 2, Nov. 2023, pp. 91-103, doi:10.61166/bgn.v1i2.40.