There is an entire chapter, about 20 pages, on Harris's theories in Berkman's The Jazz Harmony Book. It's probably the best harmony book I've ever read because

There is an entire chapter, about 20 pages, on Harris's theories in Berkman's The Jazz Harmony Book. It's probably the best harmony book I've ever read because it's extremely down to earth and focuses on worked examples. If you want videos, there's also this playlist from the billgrahammusic youtube channel: https://www.youtube.com/watch?v=KQgBnh9vUgI&list=PLxxPdgDHUaahFLV9vrz7eT1jPSpvUKdpG https://www.youtube.com/watch?v=KQgBnh9vUgI&list=PLxxPdgDHUa....