Who wrote the children's books that were adapted into the film "Bedknobs and Broomsticks"?

Kathleen Mary Norton (née Pearson, 10 December 1903 – 29 August 1992), known professionally as Mary Norton, was an English author of children's books. She is best known for "The Borrowers" series of low fantasy novels (1952 to 1982), which is named after its first book and, in turn, the tiny people who live secretly in the midst of contemporary human civilisation.

Norton won the 1952 Carnegie Medal from the Library Association, recognising "The Borrowers" as the year's outstanding children's book by a British author. For the 70th anniversary of the Medal in 2007 it was named one of the top ten winning works, selected by a panel to compose the ballot for a public election of the all-time favourite. Norton's novels "The Magic Bed Knob; or, How to Become a Witch in Ten Easy Lessons" and "Bonfires and Broomsticks" were adapted into the 1971 Disney film "Bedknobs and Broomsticks".