Tài liệu tham khảo WikiPedia: Hiên_(huyện) https://thuvienphapluat.vn/van-ban/Bo-may-hanh-chi... https://thuvienphapluat.vn/van-ban/Bo-may-hanh-chi... https://thuvienphapluat.vn/van-ban/bat-dong-san/Ng... https://thuvienphapluat.vn/van-ban/bo-may-hanh-chi...