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2. Purpose Launchpad Repository download in English https://members.purposealliance.org/purpose-launchpad/resource/
3. https://members.purposealliance.org/purpose-launchpad/tools/
4. Ries E (2011). The lean startup: how today’s entrepreneurs use continuous innovation to create radically successful businesses. ISBN-13: 978-0307887894
5. Massive Transformative Purpose, The guide to provide sense to your rojects and your life, Ángel Manria Herrera and Francisco Palao, Editorial Bubok Publishing, January 2021