• https://www.mayoclinic.org/zh-hans/diseases-conditions/depression/symptoms-causes/syc-20356007
• https://baike.baidu.com/item/%E6%8A%91%E9%83%81%E7%97%87/90924
• https://gleneagles.com.my/zh-cn/medical-specialties/psychiatry/depression
• https://zh.wikipedia.org/wiki/%E6%8A%91%E9%AC%B1
• https://www.mayoclinic.org/zh-hans/diseases-conditions/depression/in-depth/depression/art-20045943
• https://www.sunwaymedical.com/cn/conditions-and-treatments/depression
• https://www.rcpsych.ac.uk/mental-health/translations/chinese/depression-in-adults
• https://wjw.hunan.gov.cn/bsfw/ggfw/zsyd/201601/t20160118_4044336.html
• https://www.mind.org.hk/zh-hant/mental-health-a-to-z/%E6%8A%91%E9%AC%B1%E7%97%87/%E6%8A%91%E9%AC%B1%E7%97%87%E6%9C%89%E4%BB%80%E9%BA%BC%E7%97%87%E7%8B%80%EF%BC%9F/
• https://my.clevelandclinic.org/health/diseases/9290-depression
• https://www.psychiatry.org/patients-families/depression/what-is-depression
• https://www.nimh.nih.gov/health/topics/depression
• https://www.annualreviews.org/content/journals/10.1146/annurev.clinpsy.1.102803.143938
• https://www.cell.com/trends/pharmacological-sciences/abstract/S0165-6147(99)01309-7
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• https://books.google.com.my/books?hl=en&lr=&id=Ntw8AwAAQBAJ&oi=fnd&pg=PR17&dq=depression&ots=I29BDB7PCN&sig=Uu0fRtOhrXdf8S-IiyaoDUOP-UM&redir_esc=y#v=onepage&q=depression&f=false