• https://repositorio.lamolina.edu.pe/items/66472dca-1112-4e3e-9f86-aad57d426748
• https://repositorio.lamolina.edu.pe/items/8fc25f23-5842-437e-9fb8-b02d1e2ac294
• https://repositorio.lamolina.edu.pe/items/e757916d-e1d2-49ef-b4bd-e33ffa73250f