Havizul, Havizul, and Zulkarnain Zulkarnain. “Quiz Bell Design Using NodeMCU ESP8266 for Quiz Contest at IAIN Pontianak”. Jurnal Edukasi Elektro, vol. 7, no. 1, May 2023, pp. 44-52, doi:10.21831/jee.v7i1.59287.