Hammond, Pete (January 22, 2016). "'Dirty Grandpa' Review: The Worst Film Of Robert De Niro's Career (Or Maybe Anybody's)". Murthi, Vikram (January 22, 2016). "Reviews: Is 'Dirty Grandpa' Robert DeNiro's Worst Movie Ever?". McDonald, Glenn (January 22, 2016). "Movie review: The terrible, unattractive Dirty Grandpa is the comedy equal of torture porn". Retrieved January 7, 2022.