1. L. Xia: Hopes for Adding Elevators on Old Buildings in Accordance to Law. Information Times 2010. 7. 22(A17).
2. Y. Yu: Promoting Medium Height Buildings with Elevators by Cooperation. Science & Technology Economy Market. 6 (2003), p.33.
3. J.M. Cao: Initial Analysis on Elevator Installation in Multi-story Residential Buildings. Architectural Journal, 9(2003), p.22.
4. J.C. Gu: The Multi-storey Residential Can Add Elevators. Builders' Monthly. 8 (2007), p.60.
5. F. Zhou: Research on the Functional Reconstruction of Old Residential Communities in Shanghai to Suit Elder People, Shanghai Real Estate, 8(2009), pp.21-23.