1. A Framework for Ethical Payment to Research Participants
2. What's the Price of a Research Subject? Approaches to Payment for Research Participation
3. Public Law 111–255, 111th Congress. To provide for an exclusion under the Supplemental Security Income program and the Medicaid program for compensation provided to individuals who participate in clinical trials for rare diseases or conditions, 2010, https://www.govinfo.gov/content/pkg/PLAW-111publ255/html/PLAW-111publ255.htm
4. Internal Revenue Service. National office technical advice memorandum, Uniform Issue List Nos.: 3121.04-01, 3306.05.00, 3401.04-02, 1990, https://www.irs.gov/pub/irs-wd/0437030.pdf
5. Human Research Affairs/Research Management. Payments to human subjects for participation in research. Boston, MA: Partners Healthcare, 2007, https://www.fda.gov/regulatory-information/search-fda-guidance-documents/payment-and-reimbursement-research-subjects