https://123docz.net//document/3969868-luan-van-thac-si-lich-su-dang-dang-cong-san-viet-nam-lanh-dao-giai-quyet-moi-quan-he-giua-xay-dung-va-bao-ve-mien-bac-xa-hoi-chu-nghia-giai-doan-tu-19.htm