Hi Marco, a few other resources that may help:

• Simon Sinek - gold circle model (what - how - why)
• The purpose economy book by Aaron Hurst, with related website www.imperative.com
• The team canvas which includes purpose at the heart; theteamcanvas.com
• Also this Happy Melly slide deck may provide insights http://www.slideshare.net/mana.../meaning-and-purpose

If you find any other, I would be happy to hear them, as I am starting to work in this area myself

Best, Elsabeth