To vote on existing textbooks through the listing, beside each guide You will find there's link vote for this guide clicking it'll incorporate that guide to the votes. ????? ????? ??? ????? ??????? ?????? ????????? ???? ??????? ?? ??????? ??????? ??? ???? ?????? ??????? ???? ?????? ????? ????????? ???? ????? ?????? ???????? ????????? ??? ??????? ?