https://www.thebalancesmb.com/laws-and-regulations-affecting-independent-contractors-398603
https://www.consumeraffairs.com/news/employers-must-follow-strict-rules-for-independent-contractors-011315.html
https://www.simplilearn.com/project-management-contracts-article
https://www.worklawyers.com/independent-contractor-employee/
https://www.acquisition.gov/content/part-46-quality-assurance (just skim)