The Companion's Companion (novel)

 was a book intended to be a guide to travelling with the Doctor, written by Clara Oswald.

Publisher's summary
If there's one thing the Doctor ought to remember, it's this: he should never travel alone.

And to help make sure he always has someone suitably brilliant by his side, Clara has compiled this comprehensive guide to travelling with the Doctor. Packed full of hints and tips on topics such as introducing the Doctor to your family, packing for life on the TARDIS and practising alien first aid, this guide will fully prepare you for life as a companion!

Continuity
to be added