How harmful is happiness? : consequences of enjoying life or not / ed. Ruut Veenhoven ; contributions by Michael Argyle ... [et al.]Bibliography of happiness : world database of happiness : 2472 studies on subjective appreciation of life / by Ruut Veenhoven ; with the assistance of: Carla den Buitelaar ... [et al.]Happiness in nations : subjective appreciation of life in 55 nations 1946-1992 / by Ruut Veenhoven ; with the assistance of: Joop Ehrhardt, Monica Sie Dhian Ho, Astrid de VriesData-book of happiness : a complementary reference work to "Conditions of happiness" by the same author / Ruut Veenhoven ; with the assistance of Ton JonkersConditions of happiness / Ruut VeenhovenConditions of happiness : (factoren van invloed op het geluk) / Ruut VeenhovenHet gebruik van hulptheorieën bij operationalisering : een studie rond het begrip subjectief welbevinden / Josephus Johannes Cornelis Maria Hox