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Diakses 25 Februari 2020ABC News. https://abcnews.go.com/GMA/true-false-alarm-clock-affect-health/story?id=1473021
Diakses 25 Februari 2020Sleep Advisor. https://www.sleepadvisor.org/how-to-wake-up-without-an-alarm/
Diakses 25 Februari 2020Verywell Health. https://www.verywellhealth.com/should-i-use-an-alarm-clock-3014949
Diakses 25 Februari 2020