Tara, S., & Tarigan, C. U. (2026). DEVELOPMENT OF AN E-BOOK ON INNOVATIONS IN HAIRCUT DESIGNS, SIN BUTTERFLY, SIN REBEL, AND SIN LAYBOB TO SUPPORT HAIRDRESSER COMPETENCY. Journal of Beauty Science and Applied Cosmetology, 2(1), 18–27. https://doi.org/10.21831/jbsac.v2i1.2788