Ihwan, A., A. Nugraha, and C. K. Negara. “BALLONS AND BUTEYKO BLOWING EXERCISES AGAINST PEAK CURRENT EXPIRATION OF ASTHMA PATIENTS”. Jurnal EduHealth, vol. 13, no. 01, Aug. 2022, pp. 204-11, https://ejournal.seaninstitute.or.id/index.php/healt/article/view/378.