Bibliografía:
*Richard Moss Quotes. (n.d.). Jar of Quotes. Retrieved 2020-06-24, from JarofQuotes.com Web site: https://www.jarofquotes.com/view.php?id=the-greatest-gift-you-can-give-another-is-the-purity-of-your-attention
*Otto Scharmer. (2009). Theory U. San Francisco, California: Beller-Koehler .