"The King and I" was derived from Margaret Landon's 1944 book her "and the King of Siam"
It is based on the 1944 novel Anna and the 
King of Siam by Margaret Landon, which is in turn derived from .... a new vehicle 
for her client when the 1944 Margaret Landon novel Anna and the King of Siam (
a... [DOC] [TLE] Amazon.com: Anna and the King of Siam (9780060954888 ... [PAR] Editorial Reviews.