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https://repositorio.upn.edu.pe/handle/11537/42118
https://repositorio.upn.edu.pe/handle/11537/42119
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https://repositorio.upn.edu.pe/handle/11537/41712
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https://repositorio.upn.edu.pe/handle/11537/41725
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https://repositorio.upn.edu.pe/handle/11537/41731
https://repositorio.upn.edu.pe/handle/11537/41733
https://repositorio.upn.edu.pe/handle/11537/41714
https://repositorio.upn.edu.pe/handle/11537/41723
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https://repositorio.upn.edu.pe/handle/11537/41722