Recommended reading on the Tong Wars?

May 2019
The "Tong Wars" of the late 19th to early 20th century are an interesting subject imo, but when it comes to the history of organized crime in America, these conflicts seem to be somewhat overshadowed by other subjects like Italian-American mafia families or outlaw gangs on the frontier. I'd like to find some detailed reading material on the various Chinese-American organized crime groups and feuds that made up the "Tong Wars" of the 1800s-1920s.

A couple I've come across so far (but have not had the chance to read yet):

Tong Wars: The Untold Story of Vice, Money, and Murder in New York's Chinatown by Scott D. Seligman (2016)

Hatchet Men: The Story of the Tong Wars in San Francisco's Chinatown by Richard H. Dillon (2012)