11. | | Autor: Boylestad, Robert L. | |
12. | | Autor: Picault, E. | |
13. | | Autor: Machado, João Soares de Sousa | |
14. | | Autor: Manisco, Giovanni | |
15. | | Autor: Murani, Oreste | |
16. | | Autor: Poincaré, Enrique | |
17. | | Autor: Gutton, C. | |
18. | | Autor: Birch, Beverly | |
19. | | Autor: Sproule, Anna | |
20. | | | |