Recommended reading/viewing:

• Kniberg – Kanban vs Scrum [long article]
• Kahneman – Thinking Fast and Slow [book]
• Milstein – Coding Fast And Slow [article]
• Reinertsen – The Principles of Product Development Flow [book]
• Croll & Yoskovitz – Lean Analytics [book]
• Ries – Lean Startup [book]
• Anderson – Kanban [book]
• Sutherland & Schwaber – The Scrum Guide [booklet]
• Gray – A Criticism of Scrum [article]
• North – Why Agile Doesn’t Scale [vid] 
• Humble – Why Scaling Agile Doesn’t Work [vid]
• McChrystal – Team of Teams [book]

Blogs

• Crisp’s Blog (Henrik Kniberg)
• InfoQ
• Neil Killick
• Focused Objective (Troy Magennis)
• Pawel Brodzinski