I just want to be clear on this before I do any sort of writing with regards to the subject.
So I have an idea for a novel that shows a person trying to obtain his objectives using the lessons and ideas of a famous (and real) self-help book.
My question is, do I still need to ask permission from the author of the self-help book before writing/publishing it since I used ideas from his book?
Another question, would I still need to ask permission from the author of the self-help book even if I don't mention the title of his book but still used some of his ideas?