Book on becoming Realtor

[Manmohan Singh]

Hi, my wife is transitioning her career from health care to realtor. She is currently working on the pre-license course requirements, scheduled to finish in next 3 months. I want to gift her a book how to become a great realtor or on topics of tips or guide when starting your career as realtor. There are many books but wanted to know if someone can suggest a good book they have read and found helpful. I know David Green from BP is launching a book on becoming a successful realtor soon but wasn't sure if that would take another few months, in which case I can buy another book until David's book is launched. Please let me know. Thanks!!