List of insurance companies in the United States

In Search of the Perfect Health System. London: Palgrave. p. 5. ISBN 978-1-137-49661-4. "Overview of the Social Insurance Systems". Social Insurance Agency

Governance of GM Crop and Food Safety in the United States. Cambridge University Press. pp. 15–56.{{cite book}}: CS1 maint: multiple names: editors list (ลิงก์)