That drawing is from a Japanese book on the subject. I bought it a while ago and although expensive, gave a really good glimpse into life in Kowloon. edit: should add a link to said book :https://www.amazon.com/Kowloon-large-illustrated-ISBN-400008...

This is from the Japanese book that is called something along the lines of Great Illustrated Kowloon City which I have a copy of. https://www.amazon.com/Kowloon-large-illustrated-ISBN-400008...