Rocha-Vidigal, C.B. and Vidigal, V.G. 2012. <b>Investment in professional qualification: an economic approach in its importance</b&gt; - doi: 10.4025/actascihumansoc.v34i1.14181. Acta Scientiarum. Human and Social Sciences. 34, 1 (Mar. 2012), 41-48. DOI:https://doi.org/10.4025/actascihumansoc.v34i1.14181.