| https://www.cucei.udg.mx/carreras/fisica/sites/default/files/webform/delta_telefono_como_llamar_a_delta_desde_peru_.pdf |
| https://sites.google.com/view/telfonocmopuedocomunicarmecon/home |
| https://sites.google.com/view/united-telfono-cmo-llamar-a/home |
| https://peruair.zohodesk.com/portal/en/kb/articles/klm-tel%C3%A9fono-c%C3%B3mo-llamar-a-klm-airlines-desde-per%C3%BA |
| https://sites.google.com/view/delta-telefono-peru-cmo-me-com/home |
