宋涛.21世纪世界社会主义新探索与马克思主义新发展.中册.挑战与应对:当今世界社会主义运动现状与前景.Challenges and responses: current situation and prospects of contemporary world socialist movement.人民出版社,2020.
宋涛.21世纪世界社会主义新探索与马克思主义新发展.下册.比较与借鉴:国外左翼看中国特色社会主义.Comparison and reference: socialism with Chinese characteristics in the view of left wing forces outside China.人民出版社,2020.
21世纪世界社会主义新探索与马克思主义新发展.下册.比较与借鉴:国外左翼看中国特色社会主义.Comparison and reference: socialism with Chinese characteristics in the view of left wing forces outside China
宋涛.21世纪世界社会主义新探索与马克思主义新发展.上册.探索与思考:世界左翼力量对社会主义的新探索.Exploration and reflection: the new exploration of socialism by the world left wing forces.人民出版社,2020.