Tài liệu tham khảo WikiPedia: Giác_hơi http://suckhoedoisong.vn http://suckhoedoisong.vn/nhung-doi-tuong-tuyet-doi... http://thanhnien.vn http://thanhnien.vn/suc-khoe/dieu-can-biet-ve-giac... http://news.zing.vn http://news.zing.vn/khi-vdv-keo-nhau-di-giac-hoi-t...
