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2. National Science Foundation (2018). Research and Development: US Trends and International Comparisons Retrieved online from https://wwwnsfgov/statistics/2018/nsb20181/report/sections/research-and-development-u-s-trends-and-international-comparisons/recent-trends-in-u-s-r-d-performance
3. Barlow, T. (2012). The built environment sector in Australia R&D investment study: 1992-2010. Brisbane: Sustainable Built Environment National Research Centre, Retrieved online from http://wwwsbenrccomau/images/stories/BUILT_ENVIRONMENT_RD_2012_latest_reportpdf
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5. Development of a Web-Based Human Resource Sourcing System for Labour Only Contracts