Read the posts! No one said that the OP was guilty of plagiarism, we said that the author of the book was guilty of plagiarism and he was.
Actually, read this post:
No that’s not it. If you don’t cite your source or cite it incorrectly you are guilty of plagiarism
That is saying he is guilty of plagiarism. The OP was citing, technically thru no fault of his own, the wrong source (since that source got it from another source).
But with that aside, my argument is not about OP vs a book or another book, etc.
It's about the concept of plagiarism -- that one's not guilty of plagiarism if they "cite it incorrectly", as one of the posts claimed it to be.