Hariadi, Tony Khristanto, Tajus Salatin, Kunnu Purwanto, and Nafi Ananda Utama. 2023. “Design of PH Monitoring System for Koi Pond”. Kontribusia : Research Dissemination for Community Development 6 (1):142-45. https://doi.org/10.30587/kontribusia.v6i1.4634.