User:SOTO/Forum Archive/The Panopticon/@comment-188432-20121207092215/@comment-2378-20130107135918
From Tardis Wiki, the free Doctor Who reference
Wasn't it also the house style of the World Distributors annuals to refer to the Doctor as "Dr Who" in the text of the stories, at least during the early years? Not really sure if that's the best source to be citing.