1. Sheard , S. 1996 Twelve systems engineering roles Proceedings of the 6th Annual International Symposium of the International Council on Systems Engineering Boston, MA
2. Sheard , S. 2000 Systems engineering roles revisited Proceedings of the 10th Annual International Symposium of the International Council on Systems Engineering Minneapolis, MN
3. Griffin , M. 2010 How do we fix system engineering? Proceedings of the 61st International Astronautical Congress Prague, Czech Republic https://www.aiaa.org/uploadedFiles/Events/How%20do%20we%20fix%20SE-Griffin.pdf