41. | | Autor: Gómez, César | |
42. | | Autor: Grõhn, Kari | |
43. | | Autor: Kosgey, Hon Henry K. | |
44. | | Autor: Steyn, Hendrik C. | |
45. | | Autor: Léglise, Jean-Philippe | |
46. | | Autor: Juts, Jean-Marie | |
47. | | Autor: Tapadejo, Carolino | |
48. | | Autor: López Iniesta, Javier | |
49. | | Col.autor: OCDE. [s.n] | |
50. | | Autor: Seneviratne, Sarath | |