CPP (the owner of the MBTI) prevents online MBTI except through them or someone authorized to administer it. There is no free, legitimate MBTI online that I am aware of.
I have a
https://online.cpp.com account if anyone is interested although depending on the report desired, there would be a fee.
I have hundreds of books on Myers-Briggs at
Personality and Growth Bookshelf
Stephen
Power-Book Library: Free personal development, success, inspiration and motivational classics