testimonial
US /ˌtes.təˈmoʊ.ni.əl/
UK /ˌtes.təˈmoʊ.ni.əl/

1.
testimonianza, referenza, attestato
a formal statement testifying to someone's character and qualifications, or to the merits of a product, service, or claim
:
•
The website features several customer testimonials.
Il sito web presenta diverse testimonianze dei clienti.
•
She received a glowing testimonial from her former employer.
Ha ricevuto una testimonianza entusiasta dal suo ex datore di lavoro.