Need sources for:
Most recent count of Mangaka working in Japan,
http://factsanddetails.com/japan/cat20/sub135/item2891.html Potential source, don't know if it is credible though.
http://facweb.cs.depaul.edu/noriko/JapanTrip08/JETRO-market_info_manga.pdf From DePaul don't know the credibility
Japan Cartoonists Association,
JCA Website In Japanese
Citation for the Writer section,
Citation of the Editor section,
https://bookriot.com/10-questions-manga-editor-viz-media/
https://www.animenewsnetwork.com/answerman/2018-12-14/.140832
Citation for the end of the 1st Assistants paragraph See Mangaka of Hunter X Hunter,
Need a lot of citations for the Assistants section,
https://www.animenewsnetwork.com/answerman/2018-08-03/.135055#:~:text=Well%2C%20for%20one%20thing%2C%20the,portraits%20drawn%20by%20the%20assistants. Can possibly be used for Hunter X Hunter citation
New Section Becoming a Mangaka? title may be revised or changed
https://manga.tokyo/otaku-articles/mangaka-the-profession-that-underpins-japans-anime-industry/
https://www.britishcouncil.org/voices-magazine/how-became-manga-artist
https://www.tokyoweekender.com/2018/06/a-day-in-the-life-of-a-manga-artist/