I had a black dog. His name was depression.
World Health Organization (WHO)
https://www.youtube.com/watch?v=XiCrniLQGYc

Depression and Bipolar Disorder
Singapore Association for Mental Health

Depression (major depressive disorder)
Mayo Clinic, United States

About Depression
World Health Organization (WHO)

What is Depression
depression.org, United States

Depression
Mental Health Foundation, England

Depression – Overview
National Institute of Mental Health (NIMH), United States

Depression (various write-ups by Dr. Phang Cheng Kar)

Materials / Books by Dr. Phang Cheng Kar (M.D.), Consultant Psychiatrist & Mindfulness-Based Therapist, Sunway Medical Centre.

I’m Still Human: Understanding Depression With Kindness
(Expanded Edition)
Published on Jan 1, 2021. https://issuu.com/pckar/docs/im_still_human_understanding_depression_with_kindn

10 Things Not Helpful To Say To People With Depression
Updated: Sep 14, 2019.
https://www.mindfulgymalaysia.com/post/10-things-not-helpful-to-say-to-people-with-depression

10 Ways To Encourage A Person With Depression To Seek Help
17 July 2019.
https://www.sunwaymedical.com/blogpost/10-ways-to-encourage-a-person-with-depression-to-seek-help

12 Ways To Be Kind To People With Depression
17 July 2019.
https://www.sunwaymedical.com/blogpost/12-ways-to-be-kind-to-people-with-depression