I recently purchased this book, which I believe is self-published by the author, and I've found it to be a very good resource, especially I think for explaining the issue to other people who are new to the debate. It's simple but thorough in its explanations and has good source references to back up the authors words.
It might be one to recommend to people who are asking about why this debate matters and why the rights of women and girls must be upheld.
It's available very cheaply on Amazon at the moment, 99p for Kindle and around £5 for the physical book (which is quite substantial and worth the price) and I believe it's worth buying the physical copies of books which may become targets of cancel culture if you can. One unverified bad review that's basically just a repeated slur and I doubt that person bought or read the book, but the other reviews are positive.