2017
Parecki - Okta - OAuth 2.0 Simplified
    https://www.oauth.com/
    https://oauth2simplified.com/
    https://www.amazon.com/OAuth-2-0-Simplified-Aaron-Parecki/dp/1387751514
    ! 20$
    0E42F3774DFB2F75D3C127D4F92B6B4A

Richer - OAuth2 in Action
2015
Bihis - Mastering OAuth 2
2013
Spasovski - OAuth 2 Identity and Access Management Patterns