How Full is Your Bucket - Tom Rath & Donald O. Clifton (Gallup)
Discover your own strength
(Nederlands: Elke druppel is er één)
Now, Discover Your Strengths - Marcus Buckingham & Donald O. Clifton (Gallup)
The revolutionary program that show you how to develop your unique talents and strengths
-- and those of the people you manage
(Nederlands: Ontdek Je Sterke Punten)
Go Put Your Strenghts To Work - Marcus Buckingham
6 powerful steps to achieve outstanding performance
(Nederlands: Ga met je sterke punten aan de slag)