1. A process model for controlling project productivity of highway construction operations;Lee,2003
2. Grisham, The Delphi technique: a method for testing complex and multifaceted topics January 2009 International Journal of Managing Projects in Business 2(1). 10.1108/17538370910930545.
3. Zami and Lee, Use of stabilized earth in the construction of low-cost sustainable housing in AFRICA- An energy solution in the era of climate change, 2009.
4. The Delphi method for graduate research;J. Skulmoski;J. Inform. Technol. Edu.,2007
5. R.N. Sharma, Project construction management of large highway packages, Journal of Indian Roads Congress, pp. 243-268.