1. Constructing The Team;Latham,1994
2. The nature and extent of variations to building contracts;Bromilow;The Building Economist,1970
3. Building contract—variations;Hibberd,1980
4. A socio-technical analysis of the building process with special regard to variations;McDermott,1994
5. A model for the design of project management structure;Walker;The Quantity Surveyor,1981