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https://repositorio.upn.edu.pe/handle/11537/31778
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https://repositorio.upn.edu.pe/handle/11537/31785
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https://repositorio.upn.edu.pe/handle/11537/31796
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https://repositorio.upn.edu.pe/handle/11537/31821
https://repositorio.upn.edu.pe/handle/11537/31822
https://repositorio.upn.edu.pe/handle/11537/31823
https://repositorio.upn.edu.pe/handle/11537/31824
https://repositorio.upn.edu.pe/handle/11537/31825
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https://repositorio.upn.edu.pe/handle/11537/31831
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https://repositorio.upn.edu.pe/handle/11537/31776
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https://repositorio.upn.edu.pe/handle/11537/31827