Barbra Streisand was a singer who made popular the song, or possibly lyrics, "Enough Is Enough". The Tenth Doctor credited her, along with Donna Summer, when he quoted the phrase on the planet Sunday. (PROSE: Wetworld)
The Eleventh Doctor claimed that Rory Williams was the only male nurse not to have a full set of Barbra Streisand records. (PROSE: Dead of Winter)