1. The Ministry of Housing and Urban-Rural Development of the People's Republic of China: GB50500-2008 code of bills of quantities and valuation for construction works. China Planning Press, Beijing (2008) in Chinese.
2. The Ministry of Housing and Urban-Rural Development of the People's Republic of China: GB50500-2013 code of bills of quantities and valuation for construction works. China Planning Press, Beijing (2013) in Chinese.
3. The drafting group of standards: A guidance book for the code of bills quantities and valuation for construction works 2013, China Planning Press, Beijing (2013) in Chinese.