@misc{64406,
  author = {Allison Huang and Robert Chapman and David Butry},
  title = {Metrics and Tools for Measuring Construction Productivity: Technical and Empirical Considerations},
  year = {2009},
  month = {2009-09-30},
  publisher = {Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=903603},
  language = {en},
}