Healthline. https://www.healthline.com/health/diaphragmatic-breathing Diakses pada 3 Oktober 2019Healthline. https://www.healthline.com/health/how-to-breathe Diakses pada 3 oktober 2019Live Strong. https://www.livestrong.com/article/310564-chest-vs-stomach-breathing/ Diakses pada 3 Oktober 2019American Lung Association. https://www.lung.org/about-us/blog/2018/06/you-might-be-breathing-wrong.html Diakses pada 3 Oktober 2019