SUMBER:
NASA. (2017, February 20). Retrieved 2018 February, from Wikipedia: https://id.wikipedia.org/wiki/NASA
NASA – Accounting Salaries in the United States. (2018, January 31). Retrieved from Indeed: https://www.indeed.com/cmp/Nasa/salaries?job_category=accounting
Rosholt, R. L. (1966). National Aeronautics and Space Administration. Retrieved from https://history.nasa.gov/SP-4101.pdf
Werner, D. (2009, December 4). NASA Still Struggles with Accounting. Retrieved from Spacenews: http://spacenews.com/nasa-still-struggles-accounting/