Source: http://univ-bejaia.dz/dspace/bitstream/handle/123456789/5762/L%27%C3%A9puisement%20professionnel%20chez%20les%20experts%20automobile%20%28%20Ag%C3%A9s%20de%2027%20%C3%A0%2059%20ans%20%29.pdf