The official Scrum Guide is by Ken Schwaber & Jeff Sutherland

• 2020 Scrum Guide: HTML, PDF
• 2017 Scrum Guide: PDF

Community Translations

• Chinese (Simplified)
  2020 简体中文 Scrum 指南
• Chinese (Traditional)
  2020 繁體中文 Scrum 指南

Other community translations can be found at www.scrumguides.org