1. Government Accountability Office US. (2011). Defense acquisitions: Assessments of selected weapon programs. GAO.
2. Government Accountability Office US. (2018). Navy shipbuilding: Past performance provides valuable lessons for future investments. Accessed February 25, 2021. https://www.gao.gov/products/GAO-18-238SP
3. Government Accountability Office US. (2018). F-35 joint strike fighter: Development is nearly complete, but deficiencies found in testing need to be resolved [Reissued with Revisions Jun. 13, 2018]. Accessed February 25, 2021. https://www.gao.gov/products/GAO-18-321
4. Government Accountability Office US. (2019). NASA: Assessments of major projects. Accessed February 25, 2021. https://www.gao.gov/products/GAO-19-262SP
5. U. S. Government Accountability Office. (2020). James Webb space telescope: Technical challenges have caused schedule strain and may increase costs (GAO-20-224). Accessed February 25, 2021. https://www.gao.gov/products/GAO-20-224