J. Courtney, It's no longer enough to build a great product you have to build the right product. https://blog.ajsmart.com/its-no-longer-enough-to-build-a-great-product-you-have- to-build-the-right-product-c798bb0cf52a

J. Knapp, J. Zeratsky, and B. Kowitz, Sprint: How to Solve Big Problems and Solve New Ideas in Just Five Days, 2016.