Los acertijos de Sam Loyd. 117 desafíos del mayor inventor norteamericano de problemas de ingenio Martin Gardner 1992 $ 43.000 Solicitar
3000 tests. Elementary level. For the first three courses of the schools of languages. Key Book Edward R. Rosset 1992 $ 13.000 Comprar
2000 Tests. For the last two courses of the 'Escuela oficial de idiomas'. Advanced level Edward R. Rosset 1992 $ 44.000 Comprar
2000 Keys. For the last two courses of the 'Escuela oficial de idiomas. Advanced level Edward R. Rosset 1992 $ 16.000 Comprar