• http://repositorio.undac.edu.pe/handle/undac/6565
• http://repositorio.undac.edu.pe/handle/undac/6580
• http://repositorio.undac.edu.pe/handle/undac/6579
• http://repositorio.undac.edu.pe/handle/undac/6584
• http://repositorio.undac.edu.pe/handle/undac/6568
• http://repositorio.undac.edu.pe/handle/undac/6586
• http://repositorio.undac.edu.pe/handle/undac/6585
• http://repositorio.undac.edu.pe/handle/undac/6587