Pysch Central. https://psychcentral.com/blog/7-tips-to-stay-focused-and-achieve-peace-of-mind/
Diakses pada 26 Agustus 2020Pysch Central. https://psychcentral.com/blog/5-ways-to-calm-your-mind-without-meditation/
Diakses pada 26 Agustus 2020Mayo Clinic. https://www.mayoclinic.org/healthy-lifestyle/stress-management/in-depth/relaxation-technique/art-20045368
Diakses pada 26 Agustus 2020