Rosana, N., Harahab, N., Ciptadi, G., & Kurniawan, A. (2021). Theoretical Study: The Diffusion of "Piknet" Innovation Sound Wave Attractor In Bulak District, Surabaya. Technium Social Sciences Journal, 23(1), 763–767. https://doi.org/10.47577/tssj.v23i1.4535