Mother Theresa
From Tardis Wiki, the free Doctor Who reference
Bernice Summerfield had a selection of party wear which included outfits worn by Mother Theresa. (PROSE: Filthy Lucre)
On Heron's World, Sally Armstrong mockingly referred to Nurse Molly O'Sullivan as "Mother Theresa". (AUDIO: The Death of Hope)
During the Monks' invasion of Earth, a picture of her was shown on one of the screens inside the Cathedral. (TV: The Lie of the Land)
Behind the scenes
In The Lie of the Land the name "Mother Teresa" is not given only the face and monastic clothes can be seen.