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Diakses pada 19 Oktober 2020NCBI. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3601686/pdf/JFP-62-145.pdf
Diakses pada 19 Oktober 2020WebMD. https://symptoms.webmd.com/cold-flu-map/soothe-nighttime-cough
Diakses pada 19 Oktober 2020