• http://repositorio.up.edu.pe/handle/11354/3520
• http://repositorio.up.edu.pe/handle/11354/3521
• http://repositorio.up.edu.pe/handle/11354/3508
• http://repositorio.up.edu.pe/handle/11354/3509
• http://repositorio.up.edu.pe/handle/11354/3511
• http://repositorio.up.edu.pe/handle/11354/3512
• http://repositorio.up.edu.pe/handle/11354/3515
• http://repositorio.up.edu.pe/handle/11354/3522
• http://repositorio.up.edu.pe/handle/11354/3523
• http://repositorio.up.edu.pe/handle/11354/3524
• http://repositorio.up.edu.pe/handle/11354/3518