Jeong, I.-S. (2008). Analysis of the quality level of the construction CALS system. Seoul: Architectural Institute of Korea.
 Kim, C.-H. (2005). USN concept and analysis of recent trends. Seoul: Korea Institute of Information and Communication.
 Kim, J.-U. (2009). Design of the construction CALS performance management system. Seoul: Korean Institute of Information Technology.
 Yun, H.-S. (2006). A study on the design direction of the construction CALS portal system. Seoul: Architectural Institute of Korea.