Pentz, Carliann J., Daniel Rojas, Michael B. McCoy, and Christopher S. Vaughan. 2013. “A Case Study in Costa Rica about Personal Happiness: Does Health and Family Communication Have More Influence Than Quantity of Money and Material Goods?”. UNED Research Journal 5 (1):163-70. https://doi.org/10.22458/urj.v5i1.214.