1. APQC. (2017). American productivity and quality center process classification framework. Retrieved April 28, 2017, from
https://www.apqc.org/industry-specific-process-classification-frameworks
.
2. Baggio, J. A., et al. (2016). Multiplex social ecological network analysis reveals how social changes affect community robustness more than resource depletion. Proceedings of the National Academy of Sciences of the United States of America, 113(48), 13708–13713.
3. BTS. (2012). Commodity flow survey. U.S. Department of Transportation Bureau of Transportation Statistics. Retrieved April 28, 2017, from
https://www.rita.dot.gov/bts/sites/rita.dot.gov.bts/files/publications/commodity_flow_survey/index.html
.
4. BTS. (n.d.). SCTG Codes. Retrieved December 4, 2018, from
https://www.bts.gov/archive/publications/commodity_flow_survey/classification.
5. Dublin Core Metadata Initiative. (n.d.). Retrieved December 4, 2018, from
http://dublincore.org
.