Previously issued in print: 2012.
The naughtiest girl in the school. Originally published: London: George Newnes, 1940
The naughtiest girl again. Originally published: London: Hodder & Stoughton, 1942
The naughtiest girl is a monitor. Originally published: London: Hodder & Stoughton, 1945.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
The naughtiest girl collection by Enid Blyton. ISBN 9781444932409. Published by Hodder Children's Books in 2015. Publication and catalogue information, links to buy online and reader comments.
