What has the author Roberto Gulbenkian written?

Roberto Gulbenkian has written the following books:

- The Five Habits of Highly Effective People (1989)

- First Things First (1994)

- The 7 Habits of Highly Effective Families (1997)

- The 7 Habits of Highly Effective People: Powerful Lessons in Personal Change (1998)

- The 8th Habit: From Effectiveness to Greatness (2004)

- The Speed of Trust: The One Thing That Changes Everything (2006)

- Trustworthy: How People Build It, Lose It, and Rebuild It (2013)

- The Trust Edge: How Top Leaders Gain Faster Results, Deeper Relationships, and a More Impactful Life (2018)