Doctor Who Adventures (in-universe)
From Tardis Wiki, the free Doctor Who reference
Doctor Who Adventures was a magazine about the television series, Doctor Who. It usually contained stories about the Doctor, among other features.
The Doctor themself, in their Eleventh and Twelfth incarnations, frequently wrote letters to the magazine's readers, welcoming them to the issue and talking about what they could expect within its pages, as well as updating them on their recent exploits. (PROSE: Hello, Time Travellers!, Dear Readers)